JCB is right. I would suggest starting from scratch and reset both needles to the factory start point. Then work on the high end then to the idle. Repeat a couple times to get it peaked right. It's really easy to keep tweaking the idle until it good only to run into the troubles you are finding. I have a Magnum 91 four stoke that I got new and It started right and for the first tank run quite well. Then when I started trying to set it up for it's first flight, everything went into the trash. I couldn't get it to run high end, low end, only a very high idle and then it was about to shake off the plane. Numerous days of fighting with it and I finally set everyting back to the start point and it started and ran OK, Then the adjustments and it was awsome. I was about ready to use my 16oz Ball Peen on it before.

The interactions between the high and idle mix have to be well balanced. You can get the engine to run on top but not idle well or at all, or idle all day but the top end is awlfull. Once you get the balance it is like going out and getting in your car, just start it up and drive, or fly in our case.

Don