Romman is unwashed tobacco so it has 0.5% nicotine compared to the washed stuff with 0.05% so you will get buzz heavier and quicker than normal. If it's not heat it could be the amount you inhale, i have found Romman isnt a real strong flavour and is more subtle than other tobaccos so maybe your buds just arn't picking it up, try some Al Fakher and see what kind of difference it makes