I stopped shooting quads due to this. #cc in the quad is a lot, add prop and I am surprised it does not hurt worse. I have skinny legs and cannot even handle 1cc in my quad of long ester stuff.

I started shooting my TRT sub q in my stomach and it works awesome.

I think it is more the volume of gear and where you shoot it. I know it means more holes, but try shooting 1/2 one quad and half the other? See if it hurts then. Quads are just more sensitive than glutes IMO.