My current shock setup:
Front
1.3x4 piston Losi 32.5wt
TLR 22 Red Spring
Rear
1.3x4 piston Losi 27.5wt
TLR 22 Yellow Spring
*Note: I'm using the stock 1.3 x 6 pistons with two holes glued closed (CA'd the tip of a toothpick into place then cut flush) making it a 1.3 x 4 piston.
I think I need to be a little heavier on the front spring, but over all it feels pretty good.