Ok, doing a bit more math here, this is a worse case scenario, which is so imbalanced it would take a combined assault from the entire combined non-imperial game in a hit at one of OUR strongholds to simply make this retreat, and we would all lose everything...
1 ISD II, 2 ISD I, 2 ESC, 1 Neb, 3 IPV-1, 6 CRAK... This is including all hero bonus's, and keep in mind the ISD specs above... unbeatable. And dont even begin an argument about how you 3 imp players wont be working as a single cohesive unit. That would be a lie as you've already shown it. Combine this with an SSD and all 3 of their PDF fleets, the entire universe combined could never touch coruscant. As I stated, it would take all of us at one of our OWN strongholds just to make that retreat, at a loss of everything we own.
I dont understand how this is not imbalanced?
Edit: And keep in mind, with 2 max level rebel leaders, the best me and hop could ever throw at that is 4 MC-90... 4 MC-90 vs all that... lol.