I started off carrying a Glock 23 at about 1 o'clock in a cheap nylon holster... it was no way to carry a gun. I swore off appendix carry for a long time.
I started making holsters a while ago (shameless plug) and now make this style specifically for AIWB.
It's a thin bullhide that conceals well, is about as comfortable as you can expect for appendix CCW, and with the 2 belt loops, the holster and gun stay where you intend... no uncomfortable shifting or adjusting.
Just thought I'd share