im doing prop/fina in arms shoulders only... i do hit tris but only mine inner head of all spots tris ive found (next to quads) i hit nerves most often.
by the way how deep to u guys go with your bi tri inj arms are 18.5-19 now so im not sure how far is too far or vise versa i try to go until the
needles comes to some sort of painful "stop" then slighly back up and aspirate inject...