P.M.
Why haven't you had his frenulum snipped so he can nurse normally? Get a different lactation consultant - the actual amount of breastmilk consumed during nursing varies with each session because they only eat until full. Bottles give an ENORMOUS amount of food in a short time which does not allow the baby to self regulate when he's full, because of the bottle flow is so much faster than suckling the breast.
Get his tongue fixed, get a better IBCLC and start nursing Momma!!