Since the majority of our loads are similar it looks like I can at least give a little advice. I use 124gr RN bullet Federal primers 1.15 oal and unique. I have found anything under 5.2 my G19 doesn't much care for. My plinking load is 5.4gr 1.15 oal. I have loaded and shot up to 5.8 with no issues, pressure signs etc. When I tried below 5.0 at 1.15 oal I got stoppages, misfeeds etc. Try 10 each from 5.2gr to 5.6gr or so and see what you like and what works best for you.