Vanyel
Defiant didn't use the 'skimm along the surface of the big ship' tactic to avoid enemy fire in Ds9: Defiant. Nor did the various starfleet or alien vessels in the other episodes I mentioned (and other episodes).
As said - avoiding enemy fire by maneuverability is heavily depicted in trek canon; so much, that the opposite ideea is unsupportable.
Also - if a pilot stays 2 light-second away from an enemy larger, less maneuverable ship, then light takes 2 seconds to reach the pilot, starting from the ship; phasers, even longer (as per on-screen evidence, they're far slower).
Let's say the phaser beam is 1m in diameter, fired at a fighter; all the pilot needs to do is move his entire ship from from this 1 meter in 2+ seconds; with the HUGE speeds needed for interstellar travel, that's trivial (millionths of a second are MORE than sufficient).
And 'predictive' fire is equally trivial to avoid for a talented pilot; all he has to do is fly erratically, his position 2 seconds into the future becoming impossible to compute reliably (by anyone without a crystal ball that shows the future - including Data, enterprise's mainframe, etc).
Meaning - you can have arbitrarily fast computers; your chances of hitting a maneuverable fighter from 2 light seconds away remain minimal.