i think a lot really just boils down to tolerance (like you said) and that individual person's body chemistry.
for instance, the 4 grams of APAP
, general rule of thumb that IS correct. for me though, my body can handle a lot more and has caused no damage to my liver or anything whatsoever. I have an intestinal illness so things aren't broken down and absorbed like normal (plus I've had my entire large intestine removed) so things pass quicker. The reason I know all this is because the doctors performed the tests and it has proven that my system doesn't work "normally." i NEVER would have tested the theory on my own, and i still try and not take more than the 4 - but I know if I do, i will be okay.
so I have no idea how the Oxy plays into that theory of there being a true "limit" bc it seems there are many variables and circumstances unique to each individual that may or may not be toxic to another person - it just depends on your personal physiology.
if you're getting the results you want from your already current dosage, then i would stay on the regiment. no sense causing harm to yourself just for a high - especially if your pain is legit.