RM4 will give you the most traction on low bite. It has to do with the motor direction spinning the same as the tire. This allows the car to squat more under acceleration thus giving you more grip. The downside is that it will perform wheelies easier under acceleration when grip is a medium. A little bit of added weight to the front 30g-42g , near the steering servo will keep the front down. But you can out accelerate others out of corners.
Another thing is when jumping, throttle control has less of an effect in the air so hitting the brakes in the air will slowly bring the nose down or vice versa. Remember you can take advantage of coming out of the corner faster and getting on the throttle harder than most. Use it to your advantage.
I have also tested RM4 in med-high bite. It works pretty good too, but you might find that you will start to understeer a bit, thus you need to compensate by using harder rear springs to get the car to turn, and as the track starts to dry, then the car becomes more neutral.
RM3 will have slightly less traction as the motor spins opposite from the tires, hence there is less squatting effect. There is less chance of wheelies as well since the grip is reduced. Most 2WD use RM3. Normally this setting is better on medium grip tracks, but it can also work well in low grip if you use more toe in and play with antisquat. It is easier to control the attitude of the car in the air (Nose up or down with throttle).
When in doubt and you know its loose. Try RM4 first, then you can always change it back to RM3 compare.
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