Topping lift, Do you release it? It was a couple of months before I knew it's fuction! Also, when you raise the sail do you let the boom vang and mainsheet loose and let the sail lift the boom? This also a good time to ck the outhaul tension.
If all that fails, is it possible your mast is raked aft? Just a thought. if you can't stretch it out maybe a Cunningham would help. that could help get the bagginess out. Is the out haul jammed? sometimes birds build nests inside the boom. I'm far from a sail shape expert and others I'm sure will have more solutions here's a link to sail shape on us sailing Sail Shape