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My recollection, is that all the current leakage is summed; so you have 1ma from a bad corroded ground + high voltage transformer like the UV +HO units, and that's what it takes. I was in the same boat a year and a half ago, and finally stumbled across the right split on the 2 GFCI circuits that keeps it from tripping. I was at the point of replacing the standard breaker + GFCI outlet with a AFCI/Combo unit, but figured that would be just as bad, and $200 down the drain.
If you can find a good electrical supply house they may have Lutron, Eaton or Legrand receptacles. I'm a huge Lutron fan, but so far I have stuck with Leviton for price, although at $20 a pop, they're not cheap. I bought 2 when my Christmas lights wouldn't turn on... Someone stuck a used/bad one back in a box and put it back on the shelf (which I then unsuspectingly bought). Then I had to return to the store and explain that I was returning a very clearly used GFCI...
I had also looked at getting a Tripplite ISOBAR... which has some noise filtering, but I never got that far.
If you can find a good electrical supply house they may have Lutron, Eaton or Legrand receptacles. I'm a huge Lutron fan, but so far I have stuck with Leviton for price, although at $20 a pop, they're not cheap. I bought 2 when my Christmas lights wouldn't turn on... Someone stuck a used/bad one back in a box and put it back on the shelf (which I then unsuspectingly bought). Then I had to return to the store and explain that I was returning a very clearly used GFCI...
I had also looked at getting a Tripplite ISOBAR... which has some noise filtering, but I never got that far.