my grip is high like that EVERY time i pull the gun out of the holster. Slide bite is a real pain in the ass, so is changing band aids between runs... which is what made me switch to a 1911, oh that and better build quality....
i have three mags all with snl pads and the grams follower/spring kits, untuned. ALL of them reliably hold 21 and will speed load on 20.
just buy them and enjoy!
building/fitting a 9mm top end wouldn't be worth it. so just develop at low power factor .40 load, somewhere around 135PF
I personally shoot lead out of my Edge but there are plenty who run jacketed/plated bullets out of their SVI/STI's. Either one works fine but both will need you to play around with OAL to figure out what feeds best for YOUR gun.
buy from Dave Dawson @ Dawson Precision.
www.dawsonprecision.com