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Im wondering what the most Test E He's used previously is?

If not close to 750mg, that may be a bit much.
That Dbol at the end is not for a inexperienced user (Or many others)
Stop deca at least 3 weeks prior to the TE is my usual plan. Deca seems even more supressive than Test to me.
Proprionate at the end makes for a smooth landing.

A little var or primo or Stanoz dont hurt there either.