Hm. Ten of those -is- a lot. More than I remember having to fight, at least.
I don't have good advice for dominator variants, but I have defeated larger remnant fleets using Paragons.
Four of them. Under AI control. Set with escort orders to keep them in pairs that can support each other.
The variant I used is definitely not -optimal-, but it is at least functional.
5 capacitors, 60 vents, hardened shields, stabilized shields, accelerated shields, auxiliary thrusters, flux distributor, resistant flux conduits
1: two plasma cannons, in the forward hardpoints
2: two autopulse lasers, in the turrets
3: nine ion cannons, in all the small energy turrets
4: 2x HVD, 2x Graviton Beam, in the forward medium turrets
5: 2x heavy blaster, in the rear medium turrets (so that frigates can't just come up behind them and sit there safely).
If you can pull off this grouping, it is horrible horrible overkill. Most of the time. There -are- remnant fleets that can give it trouble - even take out one of the paragons, potentially. But you'll still win.