[super__dan]

It's what we refer as the vertical part at the back of the wing. I think all the team uses no gureny normally and only a few mm when running more than normal. It can only really work at speed though i.e. over jumps and a little at the end of a straight, it won't do anything in a slow speed corner and really not for traction.

Not knowing you're setup for traction I'd go to shorter wheelbase, E speed hangers high, less antisquat, 0 camber, make sure you're running it at half decent ride height as running too low will rob you under weight transfer.

The other thing is the weight added everyone describes is for dry conditions, the VERY first thing I do now when it's wet is remove weight from the front and add a little to the back (around motor and under cells, take away from under the servo in my case) this make a massive difference.