I think it was stirling moss who once said that he loved the minor because you could drive it absolutly on the limit without the local constabulary raising an eyebrow
Some of the modified guys pull off some impressive powerslides

hopefully ill be joining that club in the next year or so

170+ ponies should make that a reality
Spend some time on quiet roads getting used to how the car feels throughout the grip range, try to feel which bit of the "wobblyness" is in the tyres, which bit is the weight transfering. by getting used to how it all feels at different points in the transition of grip you will find out where its going wrong.
For example, if you can confidently determine that the initial slip angle is due to the tyres rolling and scrubbing then you can concentrate on that angle. if you find that the front is rolling and inducing wierd camber then you can look at stiffening things up (you will get shot down if you mention that on here but if you have identified that that area needs attention then the best way to learn is by tring it, YOU may prefer it while others dont ;) )
Be careful not to upset anyone while grip testing. its also worth getting used to the feel when braking hard. If you are used to the feeling when she slips, you will find it easier to cope when it really matters in a realworld situation