I pinned 2cc of t400 right into some old scar tissue on the outer side of my ass...2 days later and my hip is sore as hell...is it possible that the oil was able to sleep down into the hip?....
Sure, that is a possibility. T400 is way more likely to cause PIP and inflammation than standard-dosed gear. For testosterone, I wouldn't use a product that is over 250mg/ml.
If I were to use T400, I would definitely mix it in the syringe with lower-dosed compounds and only shoot a small amount in one site at a given time.
Does painless T400 exist? Possibly, but then the question is does it really contain 400mg of test, does it contain something like lidocaine, etc.