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Yes, I also wish the previous arrangement could be saved :(.
Duncan, you just discarded two very useful units! Vestals are good healers, and their healing also affects three factions: Inferno, Necropolis, and Stronghold. If the hero has high magical power, they are also excellent in melee combat! And the Luminaries are good with their retaliatory strike, and the strike also has no counterattack. They have the highest damage among the elite creatures.
Griffons are a problem because of a bug; it's better to use them in their unupgraded form. But with Sun Riders, it's the opposite: the Crusaders (upgraded version) have a very good charge attack + no counterattack.