Honestly sea state seem to have no effect on torpedoes with the sole exception of premature detonations.
If you follow a torp in rough seas with the external camera you will see that at times it actually 'flys' through the air between troughs.
Not very realistic but it is what it is.
As to speed, range, and course it doesent seem to effect them. I havent tested range though as I rarely take a shot from outside of 2,000 yards.
Perhaps the heavy seas are effecting your inital solutions.
Its a good question and welcome to sub sim.
Good luck have fun.
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