Not had chance to test myself yet... but my findings from using the chassis stiffner..(LAW41) it worked well indoor on smooth surfaces was the reason i said what i did.. so could work well on high grip smooth.. ive yet to find out..
When i then went outside i removed LAW41 as the car was better without it, more forgiving etc..
Tebo ive noticed has kept his on... but high grip smooth is what he runs!