DrKnow must have been thinking of the MMP which has an adjustable BEC. The BEC on the MMM can't be adjusted.
Is this the servo you have?:
http://www.rcuniverse.com/magazine/a...rticle_id=1053
If that's the case I'd say you'll need to upgrade to a servo with more torque. It's rated for 208 oz-in, most people run 300+ oz-in for truggies. The Hitec 7955TG is somewhat of a "reference standard" for truggy servos, but there are plenty of others out there that will do the job. Savox are becoming very popular. Personally I use a Turnigy HV767 on 7.4V and it's a beast!