One thing that forward speed will do, is increase the wind velocity by that much.... if the storm has about 145mph now, a 5 mph increase in forward speed would increase the winds by 5mph (assuming the strongest winds are in the right front quadrant).
Obviously, A faster forward speed also means that the storm has less time to churn up cold water and weaken itself.
I don't think 11 - 12Kts is fast enough to hinder a storm. So I can't see any inhibiting factors with that forward velocity.
-Mark
-------------------- M. S. Earth and Atmospheric Sciences, Georgia Tech - May 2020
U. Arizona PhD Student
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