Little information to go on and as Skiddins says you need to give more. I suspect though it could be setup or driving style or both. You have a heap more power there and you may be applying too much too early. Good drivers can handle mod because they have the capability to apply the thottle sensitively and proportionately - which doesn't mean you cannot
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but maybe you just need to practice. Equally a good setup with a 17.5 does not necessarily mean you have optimum setup for mod., in fact probably not. I would be inclined to jump the other way to Skiddens and think you do not have enough rear grip, or too much front grip. Perhaps try some more droop on the front to increase the weight transfer to the rear. Alternatively if you are going
around the corner a lot faster you may be rolling too much which will reduce the total grip your tyres will give you and stiffening the car could be the way to go (covering my bets there Skiddins
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)But without some more info on setup and what is happening it is difficult to diagnose & recommend.