At my worst I was taking an ounce of kratom per day. However UEI would always get me off in sub-gram dosages. I never played around with UEI that much though. That's probably why your tolerance is through the roof. 4G of UEI a day is like the same price as a mild dope habit.
Kratom is a pretty weak opioid and typically most people require a lot. But tolerance occurs when regularly using all opioids and it will continue to increase unless you take breaks between uses.
If you don't currently have a tolerance to other opioids no reason you should need more than 5g of regular plain leaf. I used to have a high tolly to H and percs but have been clean of those for 3 years now. Now less than 3g of kratom and i'm buzzing pretty good.