Maybe this is a track size thing as over here on our large outdoor tracks the Hobbywing/Sp/Orion/Tekin are the speedy to get. I have just switched to the Orion from a Hobbywing and I like it more because its smooth and has awesome brakes. Try as i may I can't get the VST motor to go as fast as my old D3/Hw combo. One of the other R10 users has a SP v3 Screaming and the other a reedy sonic that is no slouch. I would stick to a D3 or V3 MMM for fast motors that can handle boost.
Or if you want to take a risk on some old stock Amains still have some of these. Gods knows where they found them but they are gun motors IMO.
http://www.amainhobbies.com/product_...ess-Motor-175T