I thought about elevating the PSU but it currently sits under the top rail, I might see if I can simply bend that rail to clear the PSU, but then I'm not sure I will have enough room for all the cables to sit on top. There are also rivets towards the front of the case and I'm not sure the PSU will clear them, I will have to look at that.
When I extend the front cover I could see if I could stuff the cables in front of the PSU to keep the clutter off the top allowing me to elevate it and get that plug a little closer to the bottom of the case.
I could also make room on top by shortening the cables , and I could modify the power plug at that time, but I don't think I'm quite ready to void my warranty. I might keep an eye out for a good deal on a fully modular PSU though.
I think I'm going to get the F12 in there and see what that does to temps but I was thinking the same thing about making a barrier. I need to remove my temporary HDD mount because that blocks a lot of airflow from the GPU and funnels it towards the CPU, then I will probably cut an opening in the cover lengthwise following the GPU about 1 or 2 inches wide and either form or print a barrier to promote flow out of the case. I also think I need more opening on the fan side of the GPU.
Putting a 40x40 fan towards the front of the GPU is a good idea, I will look into that. Maybe I can re-purpose the Ryzen fan there somehow, lol.
Thanks for all the ideas! It's helped me re-evaluate how I want to go about doing this!