I have 2 180's and use the fact set up. Warning,, some of the mufflers with the pressure tap at the exhaust end of the muffler are known to vibrate out while flying. This will cause the engine to quit. I have one that has not failed yet, but I never put any pressue on it other than fuel tubing.

You didn't say what fuel, plug you are using. I use OSF and 15% cool power. I have also used the plug that came with the engine. They seem to work well now, earlier ones did not idle well. Check your top end rpm with a tach. Lean the mixture to peak rpm,, then drop it 300 rpm and try it out.. Jim