Tigerdude,
Ok, if I read what you said properly you are getting the buzzing from the throttle servo. This is probably caused by the fact that the servo is trying to push the throttle further than it can physically travel. The throttle has reached it's limit, but the throttle is still trying to move it. You need to adjust the amount that the throttle servo moves. First of all, at the throttle end put the control rod in the outer most hole in the control arm. At the control end the further away from the control surface means less travel. At the servo end it is the exact opposite. The further out the control rod is means more travel. So you may want to move the control rod one hole in on the servo arm. See if this helps any. You want to get your control throws as close as possible before you start trying to adjust it with the radio. If you try to adjust with the radio before you have it mechanically correct it will usually just cause more problems. If you can't get it adjusted mechanically you can then use the End Point Adjustments (EPA) on your radio to adjust where the servo stops it's travel. But I've you should be able to get it with mechanical adjustment, so I would worry about that first.

Hope this helps

Ken