Wifi issues after upgrading my wrt3200acm

after a long delay i updated my wrt3200acm to the latest from 19

i followed the extra step for my device
however its been immediately noticeable on everything (games, web browsing) that wifi performance is significantly degraded.

In the past I have fixed some of these issues with

option disassoc_low_ack '0'

but that doesnt seem to help any more
any suggestions here?

idk how relevant but in kernal log i see this

 21.570656] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[   21.631887] ieee80211 phy1: change: 0x100
[   21.646549] ieee80211 phy1: change: 0x42
[   21.673729] ieee80211 phy0: change: 0x40
[   21.778184] ieee80211 phy0: change: 0x100
[   21.798094] IPv6: ADDRCONF(NETDEV_CHANGE): phy1-ap0: link becomes ready
[   22.089446] ieee80211 phy0: change: 0x100
[   22.103174] ieee80211 phy0: change: 0x42
[   22.279707] IPv6: ADDRCONF(NETDEV_CHANGE): phy0-ap0: link becomes ready
[   22.286559] br-lan: port 5(phy0-ap0) entered blocking state
[   22.292186] br-lan: port 5(phy0-ap0) entered forwarding state
[   22.688149] mv88e6085 f1072004.mdio-mii:00 lan1: Link is Up - 1Gbps/Full - flow control rx/tx
[   22.696978] br-lan: port 1(lan1) entered blocking state
[   22.702262] br-lan: port 1(lan1) entered forwarding state
[   23.457762] mv88e6085 f1072004.mdio-mii:00 wan: Link is Up - 1Gbps/Full - flow control rx/tx
[   23.466290] IPv6: ADDRCONF(NETDEV_CHANGE): wan: link becomes ready
[  636.163486] ieee80211 phy1: staid 5 deleted

furthermore my configuration is nothing to special


config wifi-device 'radio0'
	option type 'mac80211'
	option path 'soc/soc:pcie/pci0000:00/0000:00:01.0/0000:01:00.0'
	option channel '36'
	option band '5g'
	option htmode 'VHT80'

config wifi-iface 'default_radio0'
	option device 'radio0'
	option network 'lan'
	option mode 'ap'
	option ssid 'Skittles_5ghz'
	option key 'password'
	option disassoc_low_ack '0'
	option encryption 'psk'

config wifi-device 'radio1'
	option type 'mac80211'
	option path 'soc/soc:pcie/pci0000:00/0000:00:02.0/0000:02:00.0'
	option channel '1'
	option band '2g'
	option htmode 'HT20'

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option key 'password'
	option disassoc_low_ack '0'
	option ssid 'Skittles'
	option encryption 'psk-mixed'

config wifi-device 'radio2'
	option type 'mac80211'
	option path 'platform/soc/soc:internal-regs/f10d8000.sdhci/mmc_host/mmc0/mmc0:0001/mmc0:0001:1'
	option channel '34'
	option band '5g'
	option htmode 'VHT80'
	option disabled '1'

config wifi-iface 'default_radio2'
	option device 'radio2'
	option network 'lan'
	option mode 'ap'
	option ssid 'OpenWrt'
	option encryption 'none'


some further attempts to troubleshoot, going through logs and fixing any errors

I saw the same error as in this post, and have disabled ra and dchpv6 in the LAN dhcp configuration.

There is also an error "iee80211 phy1: staid 1 deleted". I found this site which suggest to:

Do not use Autochannel

Do use WPA2 Personal with CCMP-128 (AES), you forgot to enable this last one

Im not sure where the autochannel setting is?
as for my security Im using
5ghz - WPA PSK (CCMP)
2.5 - WPA/WPA2 PSK (CCMP)

did not find a solution
even seemed lan/ethernet connections were slow too

went back to 19.07.10