There are plenty of receptors to go around...no fighting for them lol.
Biggest reason many, myself inculded, run test lower is due to the undesirable sides of high test thast are mainly E2 related!
This is true as well. There are many reasons for running Testosterone lower than Trenbolone, and this is one major reason. Trenbolone's side effects are greatly pronounced in the presence of high Estrogen levels.