I race Clodbusters on carpet, and needed a high power servo. I came across OMG servos, and have been using them for over a year now. I told Tony my application, and he sent me this one. HDT065150B.
I have never seen a servo turn clod tires like this. Ive used Spektrum, JR, and Airtronics.. WOW!! It is amazing. My times decreased, and I got to drive more aggressive since the servo wasn't slowing me down anymore, and I still use a servo saver even tho Tony told me not to use one. The rated oz is 208 at 6.0v. yea.. Its more like 300!!! I do use a Castle BEC to power my servos, just makes sense.
OMG is getting more popular in America's and for the cost, its worth it. If you want to try something different, they are the way to go.
They are on FB as well if you need to contact them.