Rb6 pistons

[Gavin Collingwood]

Hi guys I'm currently finding that I'm struggling to get the rear of the car soft enough with the standard pistons which in wet weather I'm struggling With rear end grip when accelerating out of corners, don't get me wrong it's decent but I'm really having to feather the throttle carefully and I know there's mug more grip to be had in the wet. I'm using the right tyres (bb mini spike green also) In the dry this isn't as much of an issue.
I'm currently running AE 27.5 oil with the standard pistons drilled to 1.4mm in the rear with losi yellow spring and it still doesn't feel soft enough to me compared with nick caro's. he's using a type of rounded piston but I can't remember what that piston is.
Any other pistons that you recommend over the standard ones?
Cheers
Gav