UEF changes seem fine, would have to see it play out. The Aeon SACU Chrono idea is going to be like walking a tightrope, it could be overpowered or bad. The Cybran changes are kinda odd, damage aura? The Seraphim could be very interesting, if the regen aura gives more total HP as well, it could be amazing for army escorts but the loss of shield makes them less competent lone actors.
I like the idea of using SACUs as single actors or small strike teams, but is the purpose of the changes to make SACUs become support units to be mixed into armies, or escorts for experimentals? If so, I'd say remove sensors on the UEF SACU and replace it with mobile tac defense. A stealth field generator for Cybran. I'd love to see/know what the values are on the Aeon sensors and Seraphim regen aura.