Quote Originally Posted by Monkwarrior
In an attempt to give admirals higher bonuses, I made three different traits with bonus 200 each, but again the movement of fleet was the same.

I cannot find any other method to do this and I'd like very much to find one.
Each point in movement bonus through traits is a 5% so basically you gave for each trait a 1000% increase which, pretty probably, hits against the hardcoded limit (that I guess is about 160 in descr_character.txt).