Unregulated lipo is 7.4v. Adding a lipo regulator will bring it down to 6.0v so you can use non-HV servos without burning them up.

http://www.amainhobbies.com/product_...rce/google_ext

Are you talking about Nitro or E? Are you running LiPo, LiFe, or NiMh?

Also, the 7950 is only faster if you are running it on 7.4V, if run on 6.0v its the same speed but has a bit more torque...