Many many moons ago in a far off galaxy....I once put two brand new tyres on the rear of a Mini and left the more than half-worn fronts alone.
The result was almost undriveable!!
The rear wanted to drive the front.....it would rear up the back under brakes and want to swap ends....a very uncomfortable feeling!
The point of all this?? well don't really know.....just to say that if bars were any good on Minis most of the racers would be using them (and they are not...) and that the rear end of Minis are more sensitive than people realise....maybe??
I swapped the fronts to the rear and the new tyres to the front....guess what?? Normal Mini behaviour returned immediately....
