I'm not sure what rating pink med fronts are but if they are too hard a compound they could bite more and make the car grip roll. I normally run 46 or 48 fronts on my car and if the grip is really up then I will run 44 shore fronts. Make sure the edges of the tyre have been rounded off as well so there is not an edge to bite into the carpet and apply superglue to the outside edge. You should only have to do this once.
I normally run pink med rears although recently discovered gecko 30 and 35 shore rears which are excellent. I run the tyres at 48mm starting on the rear and 46mm starting on the front although most of my tyres are a lot smaller than this as they have been run a lot. I've never needed to use addative.
A harder spring will make the car understeer but it will also make the inital bite stronger, the car will feel twitchy and this can cause grip roll.
Make sure that your front steering blocks move easily over the kingpin and will drop on their own weight. I normally polish the kingpins to help with this. If the pin is bent or the steering block catches then this can also cause the car to grip roll.
Finally is how you drive into the corner. If you approach at high speed and then turn in aggresively the car will go over. If the grip/bite is high you need to try and smooth out your corner entry as much as possible to stop it falling over.
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