ill be completely honest with you matt, i had the same problem except i fear it was worse, your not alone, i remember smoking 6 bowls out of a gravity bong (not a custom made one either, store bought) and i didnt feel a thing!
all you have to do is take 7 days off, once you smoke it will feel like amazing, exercsing also helps alot!!!, i do at least 3-6 hours of some form of cardio daily now and it keeps my as high as i wish, and if you really want to soar, try taking a month off and doing as many pushups as you can before smoke again, the europhoric rush and the tolerance build up will make it like your first time, maybe better with the europhia added to it