locate your battery pack closer to the front end. this helped my evader from lifting its nose in the air during a jump (caused by having mashers in the rear and regular 2.2's in the front)

i would suggest just getting a plane battery to do this, something small and somthing in the right voltage. i hot glue recivers, fail safes and batterys on plastic peices as they dont grip on metal.

a race setting on trucks is at full throttle, you should hear a slipping sound for 2 seconds.

also try a set of proline masher 2000's they are pricy but they work well, keep your car on the ground and wear a long time. (plus they look sweet)