So, apparently speed 30 Dominators don't mix with speed 45 Conquests and speed 60 Gryphons, because the glass cannon missile launchers get in front of the Dominators in the mad dash for the central objectives, and then can't back up because the Dominators are right behind them, despite the Dominators starting out in front at spawn. They'd probably be fine with some human intervention setting up a line initially. Typically means a Grypon dies on the Dominator side in the first exchange. On the other hand, the range advantage plus 36 Harpoons each is telling as the fight goes on.
So using 4 shield pressure + Ion Dominators with: 2 Mark IX, 2 Hypervelocity driver, 3 Harpoon Pods, 5 Vulcans, Xyphos, Converted Hangar, Integrated Targeting Unit, 30 Vents, 1 Cap
Dominators win (Conquest, Gryphon, 2 Centurions lost)
Dominators win (Gryphon, Centurion lost)
Dominators win(Dominator, Gryphon, 2 Centurions lost)
So, to try to make it fairer, I switched over to a Hypervelocity Driver Eagle:
3x Hypervelocity Driver (provides ion already), 3x Graviton Beams, 2x Harpoons, 2x PD, ITU, Stabilized Shields, 25 Vents, 24 Capacitors
Eagles win (2 Eagles, 1 Gryphon, 5 Centurions lost)
Dominator pyrrhic victory (4 Dominators, 2 Gryphons, 5 Centurions lost)
Eagles win (3 Centurions lost)
Again, the core fleet and the Dominators really don't mix, but this time the Dominators didn't have a range advantage, so the speed of the Eagles was much more telling. Essentially, Dominators and Eagles can't quite fill the same role I think, and here the backing fleet is favoring a more mobile front line, since it is so mobile itself. Probably backing with 2 Astrals or Paragons would provide a different outcome.
So seeing the impact maneuverability had on the AI, I decided to try the obvious substitution, Falcons. So going back to the original HACs, Ion, Heavy burst, swarmer Eagles, I then setup Falcons similarly:
2 HACs, 1 Ion Beam, 1 Heavy Burst PD, 2 PD lasers, 2 Swarmers, ITU, 30 Vents, 23 Caps
Also, 1 kite_Starting, to make 7 Falcons + 1 kite = 100 DP.
Falcons win (2 Falcons, 1 Centurion lost)
Falcons win (1 Falcon, 3 Centurions lost)
Falcons win (1 Falcon, 3 Centurions lost)
Pretty consistent encounters. 1 on 1, Falcon will typically lose if the Eagle's Ion beam disables the Falcons engine, but the sheer number of ships is eventually telling, not to mention a very consistent encircling pattern by the AI eventually means you've got a big ball of Eagles/Conquest in the middle without any where to back up to and vent. At least in this configuration, with a relatively speedy core fleet, the Falcons seem to "hold" better than the Eagles. Again, this is just a 20 DP Eagle change.
So trying the 0.75 shield tweak for Eagles, and doing the rematch with Falcons:
Falcons win (3 Falcons lost)
Falcons win (1 Falcon, 1 kite - kite was friendly fire when overloaded and got run over by a Falcon's shields when the Falcon was trying to get to the enemy)
Falcons win (1 kite lost)
Doesn't look too good for the Eagles, even considering the vagaries of the AI. If you want a shield tanked line that fluidly holds, you're probably better off with the Falcons, as they give you more options for ships to cycle in and out to vent, and are much faster at doing it, despite having about 2/3 the shield tank individually. In this case the Eagles are giving ground and getting surrounded by the superior numbers of ships, with roughly the same weapons loadouts. Now in theory, the Eagles are better concentrated for officers, so that might matter in a full 240 DP fleet. Assuming a 100 DP cruiser core, you need 2 more officers for the Falcons than the Eagles, for example. 7 officers in Falcons is a pretty hefty investment, although it does mean if you're willing to burn story points on mercenary officers, the Falcon fleet likely has a higher power ceiling. It's also not too bad if you're running 3-4 Capitals plus the +2 officer skill, so 10 officers plus player spread amongst 3 Capitals, 7 Falcons, and a some frigates, for example.