To be honest, against that fleet, I'd say the target priority looks more like this: Vipers (kill!) -> Dominion -> Dictator -> Victory -> Dominators. The Vipers are highly mobile, dangerous, and would soak up too much of your own ordnance to manage. Kill these first. The Dominion's long range lances, AC and torps makes this a very dangerous ship to the Eldar. In destroying this ship you free up a good deal of AC to go on the offensive as well as reducing the incoming fire when you're regrouping. The Dictator provides the same threats as the Dominion apart from the long range lances. Destroying this ship removes the last threat of ordnance attacks and frees up the remainder of your ordnance for offensive duties (against the Dominators no doubt).
The choice between the Victory and the Dominators is pretty situational. Up close the Dominators are deadly, but if you're successful in refusing his flank to only allow a single broadside, and bracing freely when up close, then they're manageable. Their Nova Cannon will most likely never get a shot off after the initial approach as you'll likely be well out of arc or well inside minimum range. If you have cover on the initial approach then they'll likely do nothing all game. The Victory on the other hand could continue to annoy you at long range when you're trying to regroup and let your BFI's fall off. So this would make it a continual threat. Since your bombers would be going after the Dominators at this point (much more effective), direct fire could well be saved for the Victory. On the other hand, if you do manage to destroy/negate the Dominators then you'd be free to tailgate the Victory and forego the hit and run tactic. If I had success, or anticipated success, with bombers against one Dom then turning direct fire on the other Dom is a reasonable choice.
Edit: @Andrew - don't underestimate bombers against Eldar. They have a slight advantage in their turrets but fighter support negates a large chunk of that. Otherwise they're just expensive ships with lower resilience. This makes bombers more effective against Eldar than non-Eldar.