I consider anything that consistently produces over 120g to be a "big yielder", and I've never got more that 60g off any Mephitso I've grown, and don't expect more than that from either of the 2 I have going now.
All my metrics: environment, pot size, lights, nutes, ect., should lead any plant to a successful finish in theory. The only things missing from my grow would be daily watering to waste (I do water to waste once per week, thanks
@Tyler_Durden88), co2, and maybe an upgrade to coco from ProMix.
I really don't think it's me, but I have no intentions of giving up, which is why I'm starting 1 Mephisto a week until I get through the 26 I have left. That's half a year of Mephitso heading my way, so I should be an expert by the end.