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I don't think there's any "the" list. I mean, personally, I'd cut the Darkhearts for a Kitchen Finks and the last Therapy, Gigapede for the last Witness, move BGH to the sideboard and add a Faerie Macabre main, and lastly cut Masticore, Rofellos, and/or Ranger for "good cards" in absence of Survival like Doran or Confidant or more Magi or even Wishes or Deeds, (Tops, Sylvans, Jittes...). But then that's just what I'd personally do, and I personally prefer to cut down on the silver bullet package as far as reasonable, which doesn't mean that's necessarily "correct" even if I think it is.
I wouldn't swap Darkheart for Kitchen Finks with Harmonic in the deck, but I'd get rid of the 2nd one. Alone, Kitchen Finks is much better and does have synergy with Cabal Therapy, but the synergy between Darkheart and Harmonic outweigh that imo. If you switch Darkheart for Kitchen Finks, you end up losing life gain (potential 6 life from 2 slivers to 4 life with Finks + Therapy), and the most important aspect in being able to have 2 artifact/enchantment killers.