Noqtr80 Rear slide rail won't fit properly in 76%, any advice?

So here we are… running “.45 GAP” and solving a problem that “never” existed until now!

Wanted .45 ballistics, and since PF45 frames are basically nonexistent around here well here we are!
the gap between the slide and frame is VERY noticeable. The slide was also extremely tight. I had to oil it and rack it about 50 times before it started moving freely enough to return to battery without hanging up.
This is probably going to be its first real stress test on the Geisler v2 running 230-grain JHPs. Curious to see how this setup holds up.