To take a step back for a second "Loosing steering ability" is a pretty dramatic effect, typically you would experience this at very high speed due to front end lift and the tyres almost leaving the ground. More realistic at achievable speeds would be slightly reduced front end grip causing increased understeer. I have a Hillman Imp (also front fuel tank, rear engine) - people used to talk about carrying a bag of cement in the (front) boot to improve grip, with modern tyres the problem is not nearly so pronounced. You can only work with what you have got - eg tyre width and front/rear pressure differences, also brake balance. Hope this helps!
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