One thing I've noticed is that certain artillery (especially Cybran) are so inaccurate that the outcome of a game can easily be determined by the RNG. Pure luck, and not skill, determines whether a shot misses the target totally or slams into an antinuke or opposing artillery, taking it out and ending the game for the loser.
This luck factor, and the fact that cybran is so inaccurate it often misses by huge amounts, missing even the large shield covering an important target, makes Aeon the only artillery that is competitive.
The factional diversity - Cybran gets more splash, etc - doesn't mean anything when certain faction artilleries don't even hit the target.
So I'm gonna propose something crazy. Like all balance suggestions, I'm probably going to get a horde of responses by high rated players - who have a vested interest in changing nothing about balance - that this is a bad idea. But, here goes :
Make all artillery accurate enough that they hit a target the size of an opposing t3 artillery with the main shell or the splash, every shot. That way, game outcomes won't be affected by the RNG at all.
That is, artillery with a large splash would have a circular error circle that is wider than artillery with a smaller splash. This would take a little math to tune right. I'm actually not quite certain what the rules are for damage in this game - if a cybran shell has a splash radius of 10 meters, and lands 9 meters from the edge of an opposing t3 artillery, will it damage the arty or not? I'm uncertain if the edge of the target has to be inside the splash circle or if the splash circle has to overlap with the center of the target.
In any case, that's easily figured out, and the math would be simple :
It's probably edge based. So if a t3 artillery is 15 meters across, and an artillery has a splash radius of 10 meters, then at that artillery's maximum range, the most that artillery could deviate from the target would be 25 meters.
A little trigonometry should let you easily solve for the maximum angular deviation permitted.
Flame away.