I use Lightwave to model and make morphs for my clothing and I never get this exploding thing. First of all are you using endomorphs when making your morphs in Lightwave? I make all my morphs as endomorphs in LW, then I create a different file for each body group,and then I use an LScript graciously provided by Daz on their site that will export each endomorph as an obj. and it works flawlessly.

Dominique Digital Cats Media