No, I'm not guessing or assuming, I'm going from past (and current) experience.
There's tons of people here who won't EVER use the recommended amounts and like I said in the earlier post, genetics has some to do with these problems too.
And if that's not true, explain to me how you can have two different strains, treat them both the EXACT same and fry one strain, and other strains thrive.
ATM, I have northern lights and white widow growing, the NL is rugged as hell, the fucking WW frys if you sneeze wrong.
edit: I'm sure the NL I"m groing could easily handle the FF schedule, infact maybe it's just my bad luck, but it seems like the NL is the only strain to date I've had luck with. I've tried a half dozen strains all from banks.
