Both these guys are right... tailstrike perhaps has the "faster" tune. The needles are interelated to some degree... meaning when you change one, the other is effected some.

Go for the transition first with the low end. As you lean you will also notice the engine idling higher... you'll need to set your throttle endpoint lower to lower your idle. So many people miss this and they use the low end to get a reasonable idle. but first get the transition til it hesitiates (a quick, almost quit effect) then back off 1/16 turn.

Then set the high end with a tach to peak RPM minus 200 rpm... then set the throttle endpoint at idle until the idle is around 1900-2000. You'll hear how guys like to get 1500-1600 and maybe that's necessary for asphalt... but at even at 2100 your plane shouldn't move on grass, and the transition is faster.

THEN... repeat this process again as chages to the high end may have changed the low end significantly enough to be too lean or rich. This will get the needles right where they should be for your setup, altitude, etc.