For lets say, an anavar 50mg ED + some kind of Test base at low does (200mg weekly), what would be the best fat % to start the cycle at?

I am quite high fat %, (15-17%), and recently went from 163lbs to 210bs in a matter of 10months.
I went from 10-11% to 15-17% though in that bulk, natural ,where I was doing up to 5000calories daily.

I love the feeling of weighing so much, but am not sure at what % the AAS are most effective, any input?

PS:
I am not going to be taking any for a while as I am 18, I just want to know out of curiosity because people always say bro-science about this stuff