I’d recommend using ROCM through a Distrobox container, personally I use this Distrobox container file and it has suited all of my needs with Stable Diffusion so far.
That is, if you’re still interested in it - I could totally understand writing it off after what happened 😅
IIRC they also just recently launched a new setting that allows you to permanently set the target resolution for all games (this might still only be in the beta branch though).
Previously you had to go into each game’s settings from Steam, and change the resolution there (which might be how you missed it).