IMO running on these big tracks here, I would strongly suggest more than 200oz for a truggy for steering.. My aces burnt up quick, my hitecs 7950 - no problem.

It wasn't long ago and you couldn't get anything above 200oz I dont remember ever any issues back then.

I ran the ace 1015 servo's for steering and throttle in buggy and truggy for a short time. The 1015 seemed strong,descent speed and smooth at first, but the gears suck. I went through several of the nylon gear. I have ran alot of the JR servo's and like most of them well. The 9100s is smoking fast and has been plenty powerfull enough but I believe it is geared so high for the amount of torque that it strips gears and is not reliable enough. The 9100t has been a durable servo for me. The ds8711 servo is bar none the most reliable strongest servo I have ever owned, but not the fastest. Currently I am running the Hitec 7955 for throttle and steering, and for racing these are the best. Although they may not be the quickest or strongest they have proven to be smooth and very durrable.
I read alot of good reviews about ACE before purchasing 4 of them, and I had problems with every one of them(all of them failed because of the nylon gear) to many DNF'S.