I just came off an 850X and an Axy's the prior year. I like my new Cat better than both of them, mine doesn't steer heavy at all. I'm running 90psi in my front shocks and I'm a 6 4" 240lb without gear on, advanced rider. Check your throttle maybe your only getting half throttle...
All jokes aside, the throttle butterflies on my cousins 17 mountain cat would not open up 100%. They would only open to make 3/4.