ummmmmm. in response to running the deca higher then test.
IMO ---> not a good idea. Even though you are on TRT and you should bounce back regardless. You run the risk of deca dick while you are running a higher dose of deca(Thats why your friends are telling you not to). 125mg a week is not going to combat 400 mg of deca.

I know if I had low libido @ your age it would ruin my cycle. I prob wouldn't even leave my house.