Okay i took the plunge and bought a new DFX. Ive used it for a couple days and all i seem to find is pull tabs and pop cans. when i put coins on the ground to try it out it seems to jump around some from nails to the coin more on the coin. i went to a spot where I'm sure there is coins but found nothing. i am using the factory settings right now. can someone give me some pointers? do i need to just get more familiar with it? it does seem like it will be an awesome machine. thanks, Mike