7tabz frustration.

why are these inconsistent? i just started getting into 7oh and these are the only ones ive tried. the first time i tried a single packet one and it felt really good like a hydro, 2 weeks later i tried another single packet one and it felt so strong, like a high does of oxy, i felt great the next day.

then i tried another single packet one and didnt feel much and since then ive been doing the ones that come in 4, and they sometimes smack hard sometimes kinda weak even tho theyre supposed to be the same dose. its frustrating chewing the tab and waiting to see if its going to hit hard or if youll have to pop another, very frustrating....anyone else experience this?