Just want something that fits my palm a little lower in rear, in most reviews people say that they prefer the 12 rd. mag for better grip.
"palm a little lower in the rear" sounds like the issue I had before and after having the 365.
I built up the rear backstrap on the Shield and the P365. Shield I owned for a long time before doing it, improved my shooting after I did. Did the 365 immediately.
But when you say you added a +2 to the flush 7rnd Shield and it works better for you still sounds like you want a longer grip? After the 365, my Shield with 8rnd mag reminds me of the G19 at least as far as length.
You definitely have to find what works for you though, it sounded in this thread or others that you already got rid of the Shield.
RE: the slide not locking back-- the Shield slide lock is very low profile-- 365, not so much. Here's some food for thought for you (and yes I know many experienced shooters were having the slide lock issue on YouTube)-- my gf's first session with her 365, it did not lock back 50% of the time. Big concern, right? So the next range session, I loaded up mags w/ a single round in HER mags and it locked back everytime with me shooting it.
Not to mention, she also shot with one of MY magazines and it didn't lock back. That magazine I've shot 700 rounds and it locks back everytime.
This is a vid of my 2nd range sesh with it, locked back 14 times, every time.
[ame]https://www.youtube.com/watch?v=SBiqrDZf00s[/ame]