a fool's errand
Trying to get a 9mm to shoot 160gr+ bullets is nothing more than turning a 9mm into a 38spl. Add to that the short bbl will never let you get to the promised land.
You need to read/study what others have tested, done and use as a minimum for short bbl'd bullet/sd combo's.
You will find that in short bbl'd firearms 2 different things keep coming up.
1. 1000fps or better
2. if under 1000fps the bullet needs to be over 200gr & 900fps+
The 800fps/160gr tests you've done are typical of a snub nosed 38spl and the results you are getting are also in line with that bullet/velocity combo.
You need look at more than just expansion. Heck you could take a pure lead bullet and drill a huge hp in it and shoot it out of your short bbl'd 9mm @ 600fps and get a 1/2"+ hp. Probably get only 2"/3" of penetration but you'll get your larger than .452" bullet.
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