In the next few days I will replace the provider's modem, a tremendous Technicolor TG789VAC, with a powerful Fritz Box 7490...because the Technicolor modem has a lot of problems...other TIM providers users who had problems with powerlines have solved with a better modem
This seems innocuous regarding the error counters.
From your Sync
21600 [kbps] / 107999 [kbps]
I believe your shaper settings of
option download '90000'
option upload '18000'
seem conservative but correct (unless your ISP uses a traffic shaper at its BRAS/BNG)
My speed it's locked at 95/20...beyond these values I never went
Now I'm trying with the values recommended by you...in the meantime I also bought a new Fritz Box modem because the Technicolor, in front of openwrt Linksys, has bothered me (often stuck)
With the settings you gave me and with the new modem (Fritz Box 7590) the situation has improved slightly...but I would still like to have a setting that allows me to prioritize one device rather than another 
Have a look over at https://forum.openwrt.org/t/ultimate-sqm-settings-layer-cake-dscp-marks/25832 to get ideas how to use veth devices to make the ingress traffic amendable to setting DSCPs which in turn should allow to prirotize ingress packets based on arbitrary iptables properties like the internal IP address; once you got that making a rule to change the DSCP completely for an internal host becomes relatively easy. I am not sure whether that is going to work well with per-internal-IP-fairness though, but it might be closer to what you desire.
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If you have just a few devices that need to be given top priority, doing it this way and turning off per internal ip fairness would probably work fine. You'll still get per-flow fairness for the lower priority machines at least, and your TV or gaming box or whatever will get highest priority.
This settings only from command line? I'm basic user 
Yes, that has not been integrated with any GUI, this is why I recommended to look into the nft-qos package as that seems to have a GUI. But I am still wondering about the powerlan devices. Could you replace these temporarily with a direct ethernet cable, just to rule out that this contributes to your issues?
I'm planing to make GUI for the scripts, this will make much easier for basic users.
But i need a lot of help to do a such thing.
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@hollywood_jack
I can make srcipt setup all things for you, you don't have to use commandline, also you can make script run at
startup. but i need to know some info about your case.
Good...ask me 
1.your connection speed up/down.
2.your mag ip address.
3.do you connect your mag via wifi or via cable?
4.do you want to just prioritize your MAG or the whole of your network (i mean give more priority for voip/mag/games,streaming services like youtube and netflix,less priority for downloads/torrents)?
5.your wan connection name eg. pppoe-wan ?
6. your current sqm config.
7.you have to install the following packages:
opkg update
opkg install kmod-veth iptables-mod-conntrack-extra iptables-mod-extra iptables-mod-ipopt iptables-mod-nat-extra ip-full ipset
Hi 
This is my setup: I have a Fritz!Box 7530 for modem and voip..."on cascade" I have a Linksys WRT1900ACS (LAN 1 of Fritz!Box modem with WAN of Linksys) with openwrt firmware...Linksys it's on "EXPOSED HOST" on Fritz!Box...all devices are attached (wired and wifi) to the Linksys...Fritz!Box LAN 192.168.178.0, Linksys LAN 10.10.10.0
1. my connection speed detected on dslreports (after SQM QoS settings): 95/19
2. MAG IP Address...here I have a doubt...because the Linksys detects me two IP addresses, one is related to the mac address of the MAG and the other I dont know if it's related to MAG, I think, I have a this moment only two devices connected, my pc desktop and the MAG (see the picture)...the MAG is connected via powerlines to the Linksys...the mac address of MAG corresponds to the IP 10.10.10.171
3. MAG connected via powerline
4. now I want to give priority to my MAG...and immediately afterwards to my Desktop PC (IP 10.10.10.146), if possible
5. interface name eth1.2, I think (see the picture)
6. SQM QoS configuration...interface eth1.2...down/up 100/20...cake, piece_of_cake.qos...SQUASH, nat dual-dsthost, nat dual-srchost...ethernet with overhead, 26 byte
7. OK 
Thank you for support...thank you all for your help
I will respond to you tomorrow keep eye on!
i need the sqm config listed here so i can edited for you!, so you will copy/paste.
How can I copy and paste here? Which command?
I mean paste the content of /etc/config/sqm here, i will edit this file, then you will copy/paste the new config into
the older one.
you can download winscp to easily edit config files.
Ok...thanks...but today I'm not home...as soon as I get home I'm attaching you
Here's what you asked me...sorry for the delay, I had a difficult weekend...thank you 
config queue 'eth1'
option debug_logging '0'
option verbosity '5'
option qdisc 'cake'
option script 'piece_of_cake.qos'
option linklayer 'ethernet'
option enabled '1'
option interface 'eth1.2'
option qdisc_advanced '1'
option squash_dscp '1'
option squash_ingress '1'
option ingress_ecn 'ECN'
option egress_ecn 'NOECN'
option qdisc_really_really_advanced '1'
option iqdisc_opts 'nat dual-dsthost'
option eqdisc_opts 'nat dual-srchost'
option overhead '26'
option upload '20000'
option download '100000'
In light of this your download limit of 100000 seems a bit high.