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I don't seem to have that issue with my ATP. Only time it masks out with iron is if both targets occupy the center of the coil the iron will dominate and you will only hear iron. Have talked to Garrett on that?

I do want people to know the ATP is not a deep machine with the stock coil but for coin shooting it is still a viable unit. Considering the release of the Simplex the ATP is not the best deal in town.

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Why do you only sweep one direction over the target? I've actually found targets similar to that using the AT, where there might be a slight blip of conductive, that settles into a nice high tone when you isolate it.

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Do you stand in the same spot when you swing? Think about it you take a step forward..... it is true you might have got it coming from the coin side first...The test was based on the best odds of coming across iron first. There are different senarios in detecting and this is just one of them. 

That test is a real eye opener for guys who use those detectors in iron. When the swing speed is introduced masked targets start disappearing to the detector. The user is none the wiser because he never  heard them. 

5X8 coil suffers the same fate.

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I swung from nail to dime and was able to get the time pretty close and it finds the dime without issue. Only time it is blind is when the targets occupy the same detection area then iron wins. I use a rusty old square nail on the test. The same blindness is on my Tejon with the 10x12 dd. The AT series 5x8 is also a dd. Do you have or access to the concentric coils for them?

I pointed out a quirk with DD vs Concentric coils where DD coils would detect steel bottle caps (round flat steel) would ring higher and out of range of ferrous target range and end up with dimes+ but can't find the post on that.

What you show is a problem but I just can't replicate it here. 

Could emi cause that?

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Are you using a buried dime? His dime is 5 inches deep, while the nail is on the surface I believe. If both the coin and the nail are in the same plane then the AT will find it.

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