Help! Engine Map switch vs Engine Mapping

Well, your new 570 should still be much more lively than your KDX but, you need to get your Fuel Control Unit (black box under the seat, under a plastic cover)flashed to the competition map. It makes the bike run cooler with less backfiring. I sent mine to "The Race Shop" in Atlanta and they did it for $25 bucks or so and sent it back. The map switch allows you to choose between 3 different fuel maps (aggressive, normal and "traction"). Whether you have the stock or competition flash in your ECU, you have 3 choices of curves, but you have to have the switch or make your own with resistors and other electrical bits.
FWIW, I still had fuel problems associated with the exhaust heating the fuel. Wrapping the header and covering the bottom of the tank with reflective tape has helped, but i eventually had to replace the fuel pump.

Yes, a correctly setup 570 will have more than enough power, certainly more than the 200 KDX.

As mentioned, the problem is probably that you are not running the correct EFI map. The dealer should have reflashed the EFI/ECU before he/she sold you the bike. If you can't get the dealer to do it for you, there are others that will for a nominal fee.

I have to run my 570 on "soft" when trail riding, otherwise the front wheel is always three feet in the air or I am looping the bike. Even with it on the soft setting I have plenty of power, it is just a bit delayed and not so fast to loft the front wheel - kind of like a softer throttle cam.

The only place I desire more power is on the pavement, and there are fairly simple solutions for that (seat mod to give it more air, pipe mod to free up the exhaust), but at this point I only use the bike for trail riding. Maybe this coming winter I will get a snowbike kit and then I will need/want all the power I can get.