I use to pin Quads, the Pip from them is just so bad. It if affects u man, then ur going to feel it everywhere during ur job and working out. I found out that glutes are THE BEST spot to pin. Can hold tons and no PIP ever really. It's hard to reach at first, but over time it becomes pretty simple.
I think aspirating is a waste of time too, so don't bother with that.
Also, my best tip too, is don't go crazy with cals if ur running long esters in the start. When I did my first 500 test, I ate so much during the first few weeks and sure didn't get as much gains as I hoped for compared to fat. So If u are running long esters, just really lean bulk till about 3-5 weeks, then make sure they are up for the remainder of the cycle.