I'm new to Hookah Pro and and to the enjoyment of smoking Hookah. Knowing certain tobaccos are wetter than others, and certain coals are hotter than others....I have trouble with getting nasty, hot ash taste as I move the coals. I am gentle with the moves, but can someone out there advise me as to the best size holes, etc? I appreciate your help. Some bowls are quite enjoyable and some are disasters. Small holes, many or few holes? Move the coals..don't move 'em? Frustrating.