I'm a relatively new Drysuit diver, so take this for what you will...
I didn't use gaiters at all initially. I started using gaiters and it did help prevent the feet from getting the "floaty" feeling that I got when I changed my attitude to head/upper torso slightly down trim positions for whatever reason. I would say that the floaty feeling was easily remedied once I finished the task at hand by re-adjusting my trim, so the gaiters, while helpful are not needed. I suppose that if I had better trim all times, and if I learned to do some actions without having to slightly invert, the gaiters would be totally useless.
From watching some people doing their drysuit checkout dives wearing gaiters, I am pretty certain that it won't help at all if the diver has major trim issues. If anyone gets into the situation that they are becoming feet-first bouyent/inverted, then practice is in order, not gaiters.
Since you are not becoming inverted,and only have some ascent/trapped air issues in the legs, I would suggest that simply more practice and a properly fitting suit would resolve the majority of your ascent issues.
Gaiters are a much better choice than ankle weights should you decide to get something. Why have a bouyency/trapped air problem that you offset with extra weight on the limbs that you move the most for propulsion (ankle weights) when you can eliminate the bouyency/trapped air problem to begin with (gaiters).
