I'm having a lot of trouble with a scout cruiser design

I have a pretty straight forward scout cruiser design (destoyer-like), and Springsharp "doesn't like it". I don't know if the problem is that Springsharp has inherited Springstyle's lack of ability to deal with destroyers, or what the problem is. I have spent the last hour "wrestling" with Springsharp, and I cannot seem to arrive at a good combination of stability and seakeeping ability. It really should be no big deal: 370ft x 38ft x 13ft, and 2,480 tons, normal displacement. The armament is light: 5-4in/50 QF and 2-18in TT. The speed is high, being 36 knots, but that doesn't seem to really affect the issue.