Want a good way to set the wide open throttle?

With it running WOT, open the highspeed needle until the rpms obviously start to slow. You've just richened the high speed mixture. And the important thing is that you know for sure that the needle setting is more than rich enough. You've starting from a safe setting.

Now start to turn the highspeed needle in slowly. This leans the mixture. And the engine will start to pick up speed. Keep turning in until the engine is screaming. Keep turning until it finally starts to slow down. Instantly back the needle back out about 3-4 clicks. It was running a safe ratio of fuel/air until it started to slow down. Then it was running too lean. That's when there isn't enough fuel in the fuel/air mix and the fuel is what lubricates the engine. Too lean, and not enough oil, and the engine heat and friction wears the sucker out in one flight. So when you finally get to the slowdown indicating a too lean mixture, you quickly turn the needle back to get a safe mixture. And that's usually 3-4 clicks back.

Then pull the TX throttle back to idle and start counting sheep.