I don't think the mass fleet tactic is going to happen. Your going to have to concentrate all your money to building a fleet, and not to mention if you want ISDs or Mon Cals you have to control specific planets. Then you will have to spend all money on the fleet leaving your other planets exposed. Not to mention to get money you need planets. So your gonna have to capture planets some how, but you wont be able to because you wont have money. Therefore your oponent will be able to capture the rest of the galaxy and then build their fleet and whip you out.
Persistant repair isnt necesary. I always hated maintenance cost in Rebellion. If you want persistant damage so badly, go buy Rebellion it has it