I guess stacking LTs is useless, As I've heard from people that all the items will be reduced to their stack limits after the rewrite.
Some guy shared it on some battleon forums. Saw it long back, tho it's highly unlikely for them to do it, as it was their mistake for not fixing the glitch before hand.
I don't know yet. I never seem to figure out what sh*t AE keeps doing to the game.