Creative, it isn't, there are many non-capital counters to capital ships. E.G. Void-lance, freeze, Gladiators/phalanx for some, a simple hyper-repair for low-dps ones, Cobra for Archangel, and the list goes on.
When you oversearch for units in hardmode, units don't replenish. Please make them slowly replenish the population. Otherwise my all thief-team on hardmode might never become reality :P
ACid rounds are brokenly underpowered right now. To fix that, I say the acid effect should be made 25% of a projectiles damage, but it can stack. So if you fire a lot of bullets at the target, it keeps corroding faster.
Nicholas, if you think about it, the station refill actually limits people from getting to strong, since people who have a ton of time can only play so much before having to wait, which allows people with less time to catch up.