My Ger/BB/1907 design

I'm experimenting with my Ger/BB/1907 design. The basic concept was a 25,000 ton ship with 8-12in/50 guns and 12-4in QF. The lower belt was 13in as was the turret face thickness. The barbettes were 10in. The decks are 3in + 1in. The designed speed was 24 knots. The dimensions were: 620ft x 105ft x 26ft, with coefficients of Cp=0.56 and Cm=0.95. The main problem I am seeing is a metacentric height that is too high. The ship would be excessively stiff, which I would think would mean that it would have a tendency to roll. The speed isn't a problem. Because of the combination of length and displacement, 46,591 SHP is sufficient to reach 24 knots. What seems to have been my originally designed power, 54,000 SHP, would actually give a speed of 25 knots. I can't tell if the stability issue is a "bug" in the specification or the actual design.