Recently got my PI Pro back from the factory for repairs. Before I sent it in, I could turn the gain all the way up, and it ran smooth here in my non-mineralized sand in NW FL. After getting it back, I can only turn it up 1/4 turn from the off position. Any higher, I get a repeatable loud signal that sounds like a good target. Got hold of the factory and they tried to tell me that my machine might just be a little hotter than some. If 9" on a nickel is hot for this machine, then I will have one up for sale soon. That is all it will do without the bad falseing. What kind of depth do you other PI Pro users get on a nickel. Thanks, Mark