As far as the GA goes, it only deals a max of 110 damage. Do you realize how hard it would be to even hit something from that range? Fog is going to play a factor and if they move at all, you will miss. Don't forget that it is a projectile, not a beam, so they can move before it hits them. For this reason, I don't find it to be unbalanced, though yes, it does encourage o-sniping, but only if you are really really good/lucky.
I dunno, I'm still not a fan. If it's a long-range projectile, what's going to be the purpose of it then? It seems to me it's primary use is going to be o-spamming the enemy base.