ORIGINAL: tacx
You say you closed the low end needle and things improved, but when you throttle up the engine hesitates, but does get to wide open throttle. You need to close it a bit more. If you throttle up and it quits instantly then you would be to lean and you would have to OPEN the low end a bit.
Reason I didn't tell you what way to twist the needle was so you could figureit out yourself. If you closed it {lean} and it made it better then you opened it up [richened it} and it made it worse what would that tell you?? By twisting the needles and seeing what happens to the engine you are teaching yourself how to tune an engine. There are hundreds of pages writen here on how to tune an engine but twisting the needles and seeing what happens is the best teaching aid anyone can get. If you did a search I bet you can find some of these pages. You can also go into Glow engines and OS support and read all about your engine. It takes a bit of work on your part but you will learn a bunch.