I stayed with the mid-motor-setup and the 17.5T Speedpassion motor. Shock-oils were 40WT front and 50WT rear with orange Losi-springs all round.
First of all I filled the diff with 1000WT oil. No more weight, because I don't want to sacrifice too much steering. Then I installed the 1,5° aluminium rear uprights, which should give more straight line traction on a slippery track (which is expected for the weekend)
These arms are 5mm narrower than the stock parts. I got back 2 millimeters with wider hex-mounts from my scratchbox.
I also use orange Losi springs now, which are a little stiffer than the original springs.
Did I mention that the Gambler has the coolest mudflaps by far..? ;-)