Hm ! Then water tension !? I've seen something concerning waterline length in the book subguru sent me. Could be this. Must check it out.
As for the buoancy reserve, 688 at wikipedia shows 87% of hull volume submerged with standard surfacing procedures. That is 13% of weight which holds the sub 'up'. Really not much, if you consider what forces have effect on the sub at high speeds.
Well I guess I'll post the demo (this weekend quite probably) and I will let you judge if it feels right or not.
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