Sounds like you never go off now and cruise on test inbetween cycles? 300 mg test cyp/wk is not TRT! TRT is about 100 mg/wk. I know I am on it prescribed by doc now. A result of my AAS use on and off for the past 10 yrs.
I sure hope that you get regular blood tests for things like a CBC and liver panel. One side effect of AAS that many dont know or talk about is having a very high hematocrit. Anything over 49 is considered too high. When that gets too high your blood thickens and you run the risk of blood clots. This can be deadly. When was the last time you had your hematocrit checked?
I just had a heart attack at the age of 38, this past summer. I just about died and my heart is now half dead. Your goal of being 300 lbs at 5' 5" is a good way to have similar problems. I sincerely hope that you reevaluate your life goals and think about what is truly important in life. If that little girl in your avatar is yours, she deserves more than that. I know because I have two little girls who are probably looking at losing their daddy before they graduate high school.