RE: Servo size
There is also the HS45, it has the same weight as the HS55 (8grams), it is a little bit smaller (narrower) but more importantly the gears are carbonite and they are "thicker" (i.e. larger overlapp between gears) than the ones in the HS55.
It looks very promissing since it is the gear stripping on the HS 55 which is trobblesome. I only have one HS45 so far and I will use it for throttle first, before I put it onto something more important...