After removing the sears and comparing them to an original set of sears I think I found the reason it's doubling. The sears with the single trigger don't have the small relief ground on the "belly" to allow proper engagement on the hammers. I thought the trigger on this gun felt very light, and that's probably why. Also explains why it won't do it with snap caps or 410 tubes. The recoil from heavier loads are jarring the second sear enough to let loose. I will add the relief in the sears and see if this fixes the issue. The pic shows the single trigger sear on the bottom compared to an original sear on the top.
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