Harder? Not sure what that is or means, sorry.
Lighter, thinner, lower viscosity, etc... in the rear, is what I meant.
I guess improper tires for your surface could cause it too, yes.
Of course, dependant on the cause of the push, neither may help you out at all.


Only way to know, on a lot of the tweaks... is to tweak in the first place

Experiment!