Have never tried trap injections. I’ve done delts up to around .5ml (maybe a little higher, but below 1ml), 1ml in lats, and IIRC as high as 3ml in glutes.
How much primo are you taking? High dose primo is my go-to cycle, and I have had no issue with glute injections for all that oil. At 700/week I used an EOD injection schedule. So, 2ml in L glute, two days later 2ml in R glute, another two days later 2ml in L glute, etc. So by the time you are injecting in the same glute again it’s been 4 days, and the oil should have dispersed for the most part. Only issues I had with that was when I was using 1.25 or 1.5 inch needles, I was burying them and getting too deep and near nerve structures. This caused almost constant aches in my left glute, but not in my right. No idea why the difference.