I'm not sure what you mean by your body being 99% test? When you are on cycle your natural test will be suppressed, and it will be shutdown completely if you use steroids like test prop.
Post CT is great to use the last 4 weeks of your cycle before pct starts to make the transition to pct easier.
Your health is strained while on cycle and that is the main use of organ ST.
What is your full stats, goals, and experience?