ive got a bit of a background in this subject, let me tell ya.
couple of months back i was pinning 1000mgs of test and 400 of deca a week. my sex drive was friggin nonexistent. all systems were a no go sort of speak. nolva as estrogen control
however, i am currently running 500mgs of test and 900mgs of deca a week...and my sex drive is perfectly fine. arimidex as estrogen control
i feel that the arimidex is making a very big difference. ive been experimenting around with the dosing and taking .5mgs a day keeps my libido righttt where it should be. taking none, my sex drive fizzles within 4 or 5 days. so my suggestion to you would be go ahead and run the deca is a 2:1 ratio with testosterone (if you really wanted the added anabolism), but make sure youve got plenty of adex on hand to keep that estrogen as low as possible.