Jeff, first Jonala is right, you can't compare to a traditional "big bike". All, even the most radical, trials bikes will feel docile and torquey compared to your KDX, or any big bike for that matter.
Actually, I was referring to the 280, as the 300 didn't come out till after the 280s. The 300 has been a torque monster from day 1. In full Raga trim (replica) it can be a beast, but with the ignition back to the 2004 standard settings, it's a nice smooth motor.
The 280 is also very torquey, however is more aggressive than the 300 in just about all instances. I think you'll find the 300 to be more to your liking, although even the 280 would amaze you. You'll find quickly that you can ride those tight woodsy hills in pretty much any gear you want and go as slow as you possibly can go and still have LOTS of torque.
In fact you'r preception of 1st, 2nd, 3rd and 4th gear will become very different, as you can quite comfortable pull away from a dead stop, up a slope in 4th gear on these bikes. In fact, when traction is at a premium, common practise is to use a MUCH taller gear than you would normally think and simply torque yourway up.
I very rarely even engage 1st gear on my 280.