WELCOME ABOARD!
When you say you saw one that was reviewed as "Not very promising", was it the 'Natural Sinking Mechanics' mod?
http://www.subsim.com/radioroom/down...o=file&id=1306
I've heard good things about that one.
On the other hand, I understand that it, or something like it, is included in the RFB, TMO and OM supermods.