trimix strength

Hey guys, I'm 69, take TRT, and have been using the Trimix prescribed by a urologist, with a formula of 20mg/1mg/25mcg, for a few months now. It works, but not that well. After injection, I'll kinda sorta get a 6/10 erection which can then be manipulated by me to an 8/10, which isn't bad, but...