Fair enough, and a good point.
As far as iconic status goes, that can be discounted as the only major factor when there's such a huge gap between the NR and IR as well.
I feel like iconic status still plays a role though given that the Imperial status symbols seem to be much more profound then New Republic symbols. Even then though, we could go back and forth there without making a concrete point or solving any issues.
To me, the best way to improve the Empire of the Hand would be to give them a unique strategical development of some sort. Overall, the three factions in Thrawn's Revenge function much more similarly to each other than the three factions in Forces of Corruption which is why I was so quick to bring up aesthetics as a significant factor.
(Speaking of which, Empire was the easiest faction to play in FoC, so that may have simply transferred over in having a ton of Empire fans already primed for Imperial play in TR. Not to mention the Empire can mass SSDs? Your guess is as good as mine here).
(Hm, adding on to this post...the EotH doesn't have any real type of Star Dreadnought available. I'm sure giving them one could boost their popularity)