unless you are trying to bulk/get strong and don't care about water retention i always recommend running at most a TRT dose of test with deca. nandrolone is almost the same thing as testosterone so if you were to run 500/500 for example that would be like running a gram of testosterone and the sides would be ridiculously unnecessary. deca is designed to be a mild steroid without water retention. it was always ran during the golden age the way i am advising, nobody ever stacked tons of test with it. makes no sense. the key though is you run proviron with it, that is exactly how they ran it and there is no reason to reinvent the wheel here. so:
test: TRT DOSE or lower
deca: 300-500mg
proviron: 25-50mg/day
n2guard
have AI on hand in case you fuck up