think HOBBY is right , they just wont hold any given temperature other than their standard temperature for long enough to get any advantage.
Even in F1 the rubber doesnt hold temp for long once they take the covers off... just see how precise the mechanics are about taking the covers
off at the last possible moment, and then the drivers still weave about like crazy to get them up to the right heat.
Going the other way - temperature wise
I tried freezing (standard kitchen freezer) slot it F15 rubber to get them to true up without overheating.....
needless to say it didnt work they just heated up as quick as normal ... it needed 0 kelvin probably !