Hey, great news, could u explain further?.
By what u say i belive that u installed this los 15.1 image, then found a GSI for AOSP (probably by phhusson) ,flashed it and it booted successfully?.
If so, is it safe as a daily driver?. I wanted a ROM as stock as possible and AOSP is it.
I apologize beforehand for my ignorance, i am not a dev but learning step by step!.