I played V10 of this mod wtih VP 1.3.4. I think this is the version where you reduced the AI unit spam and gave humans a cost increase, right?
With less units, the AI feels too easy to conquer on deity epic. After their initial wave is destroyed, they struggle to rebuild enough units to get a coherent front up again. Even more so if they fight another AI before I attack them. Inter AI wars keep them weakened for a longer time. I could feel some cost increase, but as you rarely use units as a human player, it does not impact you as much once you have your army built.