Dark Serpent Gate
D27 = Compound.
D28 = Compound, Devilish Drudgery
Opinion: Bad Gate.
... Swapped out for...
Dark Bishop Gate
D27 = Devilish Drudgery, Clock Tunnels.
D28 = Devilish Drudgery, Clock Tunnels.
Opinion: Good Gate.
Additionally, I have modified the existing gates to note fiend strata for farming glyphs [added descriptions in the OP].
Jade Rook Gate
D27 = Treasure Vault, Clock Tunnels, Lichen Lair, Graveyard
D28 = Compound, Lichen Lair.
Opinion: Bad Gate [with a chance to be okay].
... Swapped out for...
Iron Pawn Gate
D27 = Clock Tunnels, Devilish Drudgery
D28 = Compound, Devilish Drudgery, Clock Tunnels
Opinion: Good Gate if you wait for both Clock Tunnels.