I see the UEF mobile shield as a strength of the faction, and it compares reasonably with the Aeon given how their fixed shields compare (i.e. Aeon is stronger but smaller for fixed shields, the same is the case for the mobile shields).
Aeon does have better and more efficient shields. However, the size difference when comparing the 2 mobile shields, is negligent. We're talking about a smidge more shield radius and in practicality, it's literally nothing.
Similar to how you said you were comparing static shields, I was trying to expand on that with the UEF mobile shields, a bit. Hence they cover more but have almost the same HP - and are far worse in efficiency.
So the only change I might be ok with is a slight reduction in energy maintenance, since comparing T2 fixed shields the UEF costs 200 vs Aeon's 150, so having the mobile shield cost say 65 (instead of 80) would be more in line with that sort of a ratio.
Of course! That is why I offered 2 suggestions.
One to reduce the maintenance cost and one to expand on the unit a little more.
Boosting the shield health to me runs counter to the faction identify on shields, while increasing the shield size to 19 makes it comparable with the T3 mobile shield size for a T2 unit.
Perhaps you are correct here, but I do want to point out that the UEF does kind of similarly match Seraphim in coverage - in the T3 stage of shields, at least. The unit is far worse, too! We're talking about having a third of the HP. I mean... it is T2 vs T3.
~ Stryker