Hey! I dug this one from the wayback, but am curious about your thoughts on the allowance for thick undergarmets. I also ended up going that route, but am a little worried about being a balloon when I'm diving the 250 undersuit. Diving Minnesota - a lot of the water is sub 50 degrees and down to mid 30s F.
It doesn't matter how big and loose the suit is. It won't be a balloon unless you put enough air into it to make it a balloon.
If you run it like @eweingarden said and just put in enough gas to let your undies fully loft, and then use your wing for any additional buoyancy that you need in order to get neutral, it should be totally fine.