Things to check that everyone seems to miss with the ATP.
1. Make sure that coil to Head unit cable is wrapped SNUG & The end fitting is ALL the way in, its a little tight but makes a triumphant difference
2. Make sure when you GB you raise and lower around 7-9" and and the lowest downward stroke should be 1" from the soil/ground and that's where you would swing from.
3. If you are near any electrical boxes, move away, it has a huge disturbance with these machines. I was 25' away from one once and it was just going Bat $hit crazy, got 40' away and it completely stopped.
Good luck!