I've done a ton of top-ends over the years, but this is my first KTM. I'm unfamiliar with this "X dimension" setting. Is this something KTM guys really measure and worry about, or do you just get enough gasket thickness to insure the piston does not totally top out the bore? I'm running a 250 SX for woods racing, so it's not like I need to wring every ounce of power out of the motor. Any advice?