The cut actually turned out pretty great, however the holster itself is a piece of shit.
I've never had a kydex that didn't click... Until now. The gun slides into place like a mosquito dick into a porn star. Even after tightening the adjustments, it's just not a good fit. The flashlight appears to have been fitted about 2 clicks outward from where it should be, but whatever I was ok with leaving it that way. However, it still didn't click or stay in place when any minute amount of touch was applied to the butt of the gun. Without the light, the holster fit was even looser even with adjustment.
So the holster is going in the trash and I'll buy one elsewhere. Thanks for the help all, the integrity after the cut was solid. The mod would have been a success and looked decent had the actual holster been solid.