IX is a great boat. It has a long range so you can reach the American coast and the tip of Africa. It carries loads of torpedoes, hence more kills, more tonnage and more renown. It's a bit slow in diving but nothing you cannot manage. Usually you stay away from shallow areas as one tends to hunt in the ocean with it.
As far as the buoyancy issue you're refering to I don't know. I never experienced it and I've used the IXC quite a lot. I had no problem in maintaining depth even at 3 knots. Are you sure you're not seeing either 'crash dive blues' as said before or heavy seas effects???
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