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I went the 9" / 3.50 route. I briefly tried a 3.25 ratio, and it was a total dog. (Note I live up high, 5300+ ft, and plenty of hills/mountains). Even on flat ground with a 30 mph headwind I couldn't accelerate past 50. Swapped in the 3.50 and it is about perfect.
It won't hurt your engine to spin it up closer to 3000 RPM. And I'm not sure I'd want to drive at 65 mph in many places except wide open highway with no traffic, with stock brakes and suspension. These trucks just weren't made for that. I'd enjoy what you have, 55 isn't that slow.