may i ask why u want to be clean?
IME it only helps get you higher for the first couple times, then your back to normal shortly afterwards. i think tolerance has more to do with your receptors in your brain, and each individual phenotype/plant rather than body mass and metabolism. also has alot to do with tolerance education, meaning the more you smoke the same strain the less it does. thankfully OGK is one of the strains with the best tolerance education u can get. hence its popularity, all the chem strains carry that attribute typically. even casey jones which only has a small % of chem.
btw good job on not picking it early. like i said: OGK is a SATIVA, not an indica(for the most part). its probably the best example out there of a sativa that typically grows much like an indica. ive hardly seen any OGK be ready at 8-9 weeks. it usually closer to 70 imo. not that its set in stone or anything, theres always exceptions.
in fact your ogk looks more indica than mine did, just keep using that 60X to look at the heads and pick it as soon as u see approx 20% amber or less. ive had bad luck with more amber than that lately. then the buds seem to decompose a bit as they are stored away in jars. so make sure u catch that ideal window. i think ull get it.
i actually just popped a seed of dinafem ogk the other day
all of a sudden this strain is getting more attention. it deserves it.