So basically this has only happened with tren in the mix. I have heated up the vials before and has helped. Question being is there anything that ever is fool proof? Like something I am missing?

I have had the experience where it’s smooth no issues, then other times a bit sore next day (which I expect and don’t really give a shit about), then there were a handful of times where I could not walk from quad pin. Cyp,sustanon, mast, bolderone never gave any issues with pip for me...just the tren sometimes