I dis exactly the same thing. Ran ubuntu for prob 12-15 years. Been following bazzite since it started and was getting frustrated with ubuntu snaps and gnome. Decided to give bazzite and kde a go and damn i fell in love. Its now my daily

From reading the github for proton it looks like there a good number of bugs in the latest drivers. Pwople have had success running with older driver but ahit performance.

Im running in proton with experimental on a 6700xt on high and have no issues at all. I dis have to install newer vulkan driver ppa. Ibuntu base drivers are old