Eventually I'd like to try a set of those out. I replaced the #2 pistons with #1's that have larger holes and stuck with the 27.5wt oil. Truck felt better around the track but was still misbehaving a bit down the straight and coming off of jumps. I couldn't figure it out. Then I took a good tumble after a rythem section and broke a solder joint. While inspecting the motor, I discovered the bent axle that was there the whole time!

New CVA bones on the way and problem should be cured.