RWD car and your body writing cheques your skills can't cash.
However I'll differ from some of the comments on here in that:
1) Wider, stickier tyres will only help you get further out of your skill zone and it'll kill you eventually.
2) If you don't know how to "fix" this, you should probably be really revising how you approach your mods and the extent of them, before someone else gets killed.
3) Do some tuition.
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