OK, I came across this post by Ducimus:
http://www.subsim.com/radioroom/show...+tower+upgrade
Like I remember, your performance does play a role. I'm wondering if lowering the earned reknown needed for a successful patrol will get you an upgrade, but not screw anything else up. Lets face it, in reality Fleet Boats were not offered upgrades as a result of captain's performance. This notion of points is arcadish IMO. When modifications were proven to be benificial, they were incorporated as time allowed, more sooner than later. New construction had them incorporated into their design. I won't feel like I'm a cheater if I lower the points to get my overdue historical upgrade. The only thing I want to know is if it could be done without messing something else up? RFB+RSRD used by the way. Thanks.