Possible to lower ping?

Hi Community! Is it possible somehow lower ping in OpenWrt? When i ping using my openwrt x86 router i got 9 ping in 88 mile, when using Mikrotik rb750gr3 with routerOS i got 4, when tp-link archer c5 v4 (native os) i got about same (4). I'm already using SQM with cake setup, but did not helped at all.

I also tyed install OpenWrt onto tp-link, it gets even worse, about 11...