The 1660 super works fine, but it's also a 120w card vs a 220w. It's also physically smaller, so there is more room for the hot air to escape.
I'll just run it with no sidepanel while gaming for now, while i evaluate the options. I guess this is the classic buy cheap, buy twice. I was looking at the Sliger and Ncase cases, but the price and availiability put me off. I have 6 weeks offshore to rethink my life choices, if i want to get another sff case.