Have you tried using magnets? I've gotten some nice results creating heroic sized glutes for various male figures using magnets. You can set the magnet adjustments to also affect the hip and then you don't get that weird cleft you were referring to. Then there's a python script you can use to create a full body morph that includes the magnet adjustments. (I haven't really tried this myself yet but its supposed to work) You can use that FBM when doing your wardrobe wizard conversions. 

It takes some experimentation to get the hang of placing and sizing the magnet components but you can really get some nice results if you have the time to noodle around with them.