You sure your uboat files are stock?
There is absolutlly no reason i can fathom for stock uboats to behave like that. As near as ive been able to discern the crux of GWX ubooat behavior model lies in mass, in conjuction with the surface and submerged displacement variables.
Off the top of my head, if you have a surface displacement of say 1192 , if you set your mass to 1191, you'll have positive boyancy. If you set your mass to say 1200, you'll sink like a rock. Go to flank, blow ballast, it wont matter, down you go. Too light a mass and i think you gain too much positive boyancy and you'll be unable to dive, riding high out of the water like a cork. Yet 0 mass gives neutral boyancy.
Re examine your displacement and and mass variables. I think you got something hinky there.
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