I can also confirm that the KF with low grip chassis works very well in both low and high grip scenarios.
Some evidence of this was just last Thursday at Surrey & Hants - due to the numbers I got placed in the 4wd heat against 4 XRAY XB4s (2013, 2014 and 2 2015s) all set up for the wet.
One heat I was happily keeping them all at bay for the majority of the race until I messed up big time.
Now considering I was runing a 7.5 and some of those were running 5.5s I think it can handle itself