There's nothing wrong with Aurora: they're (almost) a T1 sniper.
But Aeon needs a T1 tank: something with enough HP that it can survive 1-on-1 vs any other T1 tank much of the time in close quarters. Perhaps a new unit with the speed of the Aurora but the range of other tanks, with similar DPS but 20% more cost and 30% more HP.
Given a new tank, one could even try balancing the Aurora more like other snipers: lower DPS but a little more speed. (Currently DPS must approx. match other tanks for balance to work with smaller numbers, but then Aurora get too powerful in large groups due to range, except vs bombers...)
If the unit count really can't be increased, there is another option, though many would consider it heresy: turn the Flare into a T1 sniper/LAB hybrid and the Aurora into standard medium (or less-standard heavy) tank.