Really bad PIp is actually the hormone crashing in depot in your muscle. Like you know how sometimes poorly brewed gear makes crystals on the vial? Think about that happening in the muscle. Your body then reacts with a "WTF!" Auttoimmune response. Swelling, redness, knots.
I wouldn't try anything over 200mg/ml, but with miglyol it might hold at 250.
I have had 100NPP/100TPP that was painless and it was AWESOME. 2ml EOD.
I'm gonna try to make this one day: 75TPP/75NPP/75mast prop per ml