@nbd I hope you're having a good holiday right now. If you're around I'd love to know if I should log this on https://github.com/openwrt/mt76/issues or if I could do anything more?
For the r6220 only version 18.06.9 work properly.
Thanks for the tip to go back to the old release. I went down to 18.06.9 and it does indeed work much better than 19.07.5 or the current SNAPSHOT:
5Ghz to another room
5Ghz in the same room:
2.4Ghz in the same room
The last shows even 18 wasn't perfect
2.4GHz to another room:
It's still not as good as the ath10k, but this is better.
maybe porting 18.06 mt76 version to 19.07 would be the option?
Platform to the issues in mt76 https://github.com/openwrt/mt76/issues