if they block sledgeB I usually go with a,a,a,c,d sledgB, with a few variations, like 6a if they seem to try to jump out of it, or a quick a, B+C, sometimes catches them off guard as long as they aren't barrier blocking...
gotta try that a,a,b,720, sounds fun, if they are magnetized does it consider it a combo grab or does it leave them far enough away to get an unbreakable?