I will openly say where I train and with whom seeing as I am a lifetime natural.
I am a brand new BJJ brown belt and Golden Gloves champion in/with the (former) Carlson Gracie Jr. system. As well, I am a mainstay sparring partner at Duke Roufus' place. I poke in and out at MTC. Run this list to see who trains there. No one is on juice, NO ONE! It is frowned upon and laughed at openly, at least in these three circles. Technique and time are paramount!
There is this lingering (and sometimes odd) assumption that MMA is riddled with steroid monkeys? Very, VERY low level guys pin and high level guys whose natural progression has slowed to a non-competitive rate. Conversely, there are plenty of 'cheater' exceptions to this rule.
Why compete if you aren't natural? I've never understood this*? (notice the asterisk) I will start cycling after my competition days, I want to know my limits.
I suppose I didn't answer the OP's question. It's not my intention to preach, I just want to give feedback in earnest. The very best to you, regardless of what you decide!