the t3 thing all started with thyroid problems after long durations of gh use, ive never ran it long enough to experience any such problems!
ive never shot im, always subq,,, i dont think its makes any differenceas long as your getting it into your body
the fullness in the delts is most probly just down to a little inflamation from the pinning, which isnt a bad thing, im loving the feeling in my triceps from shooting all my gear in the long head