I fly all 3 ship types for both factions. I have 91% of the GSF achievements (early access). All in all the game seems fairly well balanced so far, but these are my tweak suggestions.
1. Make companion ability options exact mirrors for both factions. Currently this favors pub side in at least three ways and may very well be the primary reason pubs win more. Please match the imp side to the pub side rather than vice versa. The imp side options are gimped.
2. Make C in Shipyards equidistant to both start spawns. C is much easier to defend than capture, but is closer to the pub start spawn.
3. Increase range of all strike fighter weapons by 5%. May ultimately need to be boosted to 10%, but I would try 5% first. Strike fighter variant of same weapon should have longer range than scout variant.
4. Reduce lock time on concussion missiles by 0.2 seconds.
5. Reduce lock time on ion missiles by 0.2 seconds.
6. Reduce lock time on sabotage probes by 0.2 seconds
7. Reduce lock time on proton torpedos by 0.5 seconds.
8. Reduce lock time on thermite torpedos by 0.5 seconds.
9. Give ion cannons a default non-stackable 5% slow that lasts 8 seconds.
10. Reduce Bypass to 30% shield piercing for 12 seconds.
11. Debuffs from Ion Railguns should scale based on how charged they were. Simply clicking on the ion railguns should not give the full debuff. AOE should only work at 50% charge and greater.
12. Slightly reduce accuracy and damage of spawn turrets.
13. Give objective points for holding a node blue.
14. Siege medal should be 4 turrets. Demolisher medal should be 6 turrets. Crushing the Defense achievement should be 10 turrets destroyed. Having these as high as they currently are requires potentially losing the game for your team in order to accomplish them. I farm these with a gunship on an alt on the imp side since it is more likely the imp side will be losing anyway.
15. Autoboot "players" AFKing at spawn. Give no credits, XP, or req for players with zeros across the board. [Note this only works fairly if players get objective points for holding nodes blue]. This has become a really annoying issue imp side on The Harbinger. Are they AFKing for the credits? Experience? To troll? I have no idea, though one of the regular AFK players is named such as being AKF in PVP matches seems to be the point of that character's creation. I have just started leaving games that have regular afk'ers in them. I'll go play pub side until their bed time.
16. I don't switch guns or missiles on either of my strike fighters. So in each case the 1 ability is wasted. Unlike with Gunships where clicking a target twice with ions and then switching and doing a full slug is very effective, switching weapons on strike fighters is not nearly as useful. The strike fighter ion lasers/missiles just don't compete with the OP gunship ions. Plus, with the ion lasers having shorter range than the heavy lasers they don't make sense as the opener. I would much rather have a strike fighter with a custom 1 ability like the scouts have. I still struggle to find a reason to fly a strike fighter other than to accomplish the achievements that require them. I fly a strike fighter when the games are hopelessly mismatched and we will win regardless of what I fly.
17. Ships returning to spawn for safety should be put in time out for 12 seconds giving them time to gather their courage and re-enter the game. Cooldowns should be paused during this time. If the player had 25 seconds left before they could use an ability again when going in to timeout, they should have 25 seconds left when they are respawned out of timeout.
18. Evasion should scale to some degree with speed. It doesn't need to be 1:1. Stopped could be 75% of evasion value compared to full, 100% of evasion value.