You don't mention how long you had each pair of kegs in each fridge but maybe the pils and bitter are just warmer than the other 2? The sanyo isn't cooling as much as the fridge? What your beer temp after pouring for each keg?
Maybe a tower cooler (blower set-up) would help too?
Fermenting: Azacca Oat Pilsner, Egregious-ish, Barrel Fermented Dreg DelcoLambic, Sacch Trois Helles
Drinking: RIS v7, Doppelbock, RIS v6, Carrot Blossom Cedar Mead, Sauerkraut Fermented Gose, Gueuze, Brett Blonde, Kriek, Saison, Sour Blonde
Barrel aged: Rye Barleywine, Tripel, Wee-Heavy