My method helps me, but it is the nature of the beast. I ground balance at the water's edge while in the slow mode and not taking a wave over the coil. I do not set DISC above 3...above 3 I start to "loose" nickle targets. I try not to detect in less than 3 feet of water if the surf is more than a couple of inches. The higher the surf, the deeper the area I stay in. Sometimes I search for the quietest frequency if the "falsing" is too much.
As for the coil cable: I have the smallest loop from the coil directly to the shaft so that the coil can be rotated its full range. Then run it straight up the shaft and use electrical tape to hold it in place until I get to the lower and upper shaft point at which I start to wrap the coil around the shaft up to the control box area. Here I use the electrical tape to hold the wraps tight.
I have a shaft for each of the coils I use on the Infinium so I do not have to tape the coil cable when I change between coils.
As Casper said, with an increase in discrimination you will loose some depth, you will also loose nickles. If you loose nickles, you will start loosing gold. No matter how bad the "falsing" gets I never turn the discrimination up to the point of loosing a nickle target.
While swinging, the more consistent you are in keeping the coil parallel to the bottom, not lifting the coil at a sweep's end and the more uniform the bottom is the less "falsing" you will hear. And remember the more and faster the depth of the water changes, mainly due to wave action, the more "falsing" you will encounter.
Even with the "noise" or "falsing" I enjoyed the Infinium for almost 10 years. When I received an ATX for Christmas two years ago, the Infinium has taken a back seat. With the ATX's sensitivity, discrimination and audio adjustments along with it's circuit improvements...it has been my primary detector in the waters of New England. I can not wait to run the ATPro with the NEL BIG 15X17 coil in the fresh water lakes this summer. The ATX will probably take a back seat at the fresh water lakes...we'll see.