Weapon Master, thanks for the follow-up feedback. Before I make balance changes I really have to make sure the feedback is based on the actual situation rather than an older-version or an incorrect perception, etc. Otherwise I wind up balancing a different game
But it does sound like the platforms are being a bit much numerically. 98k DPS per MkIV is correct, but 19 of those on a single planet is probably excessive. I'll look at their per-planet and per-guard-post caps and probably adjust them down a bit (my guess is that it's 2 per guard post now, I'd shift that down to 1). If that proves to be too much of a nerf then the individual stats can be buffed up a bit, which has the side effect of making them better for the human player. Since the human player gets so very few of them that's not a bad thing.
One mechanic to keep in mind is that if you cover your fleet ships with a forcefield (either a normal ff generator or a riot shield or one of the other similar things), they're immune to tractoring. Granted, that can get very dicey if the ff suddenly takes a lot of fire and those fleet ships are suddenly not covered anymore, etc (multiple overlapping ffs help). But it's something to keep in mind, particularly if you happen to have the shield bearer bonus ship, or access to spirecraft shieldbearers or fallen spire capital ships.