Check to make sure you're avoiding scar tissue as it was happening to me when I hit some in my quad. I remember hearing either advair or singulair helped with tren cough as tren supposedly acts as a leukotriene which causes some asthma attacks. Maybe try using a slin pin too as the smaller needle has less of a chance of nicking a vein. Maybe a 27g 1/2" inch can suffice?