As others have mentioned, as have you... there is not much out there about the .45. I have shot the 9mm and found the trigger pulls hard.
However, my contribution to this thread is more along the lines of the barrel length. Though I'm sure you are up to snuff on ballistics, I just wanted to recommend a video on Federal HSTs that uses a 3.3 XDS. I carry and shoot .45. I looked at this video and similar ones to try to find if bullet weight or loads would be much affected by barrel length. My PX4 .45 has a 4.1" barrel. https://www.youtube.com/watch?v=HfqM3grAiyI
It is possible that a lighter bullet weight could recover some velocity in the 3.3. It also might reduce recoil, enhancing follow-up shot times.