I think soaking initially is the way to go on all denim. I've had sanforized jeans shink too much in the washing machine and it really bummed me out. Indigo loss and the affect on fades is so over exaggerated.
I had a thought today when I was putting on my 003s. Has anybody ever heard of getting the top button moved over slightly to alleviate some waist tightness? Kind of like how on a suit you can tailor the top button over slightly to alleviate pulling. I guess there'd be left over hole but it'd be worth it to continue wearing a jeans, maybe it could be patched too.