Hi there weazle!
Without knowing how your F75's set up it's hard to help but I'll try. Try turning down your sensitivity and see if that helps cut down on the chatter. The only time I get a lot of chatter is when I'm near a power source or close to strong radio waves (or around a pinata tree lol). Not saying this is your problem.
I just figured out radio waves this past year when my detector started chattering like crazy for a short time and I swore it had a cadence to it, then it quieted down. About 15 minutes later it started again and I noticed the same van driving by. As the van disappeared, the chatter also slowly disappeared...the guy driving was a ham radio operator. I've also noticed it when hunting near the airport when planes are taking off or landing and I swear I can just about hear voices through the chatter.
I've never dug a good target that was up in the high 90's, and Ive dug a lot of those signals, but mostly out of curiosity. Those high signals always turned out to be rusted iron or large smashed cans. Around 91 / 92 has been the good target cutoff for me, at least in the type of soil I hunt in.
The best thing I can tell you is to use your ears first and the VDI values. I've found that even when I get a bouncy signal, when that high tone squeaks through, it has a unique smooth sound to it that after you hear it a few times you'll recognize it immediately.
Good luck!
Mike
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