If it's not that you are pushing hard then i'd check the tyre pressure and the rebound and compression settings on the forks. Also would be worth the time checking on the rear shock settings. Does it let go when you bring the power on, constant throttle or throttle off?
There is a thread on here with a full write up on the various tyres from one of the magazines. As they say, all modern tyres are good, but some tyres suit some people, and some don't. It all depends on what "feel" you feel comfortable with and your riding style. Good luck with getting it set up to your liking and putting a stop to the front end letting go :thumbup