Ships & Modules

domi works best as a support when it can RR or cap chain with the dps boat. Mael with 8 guns can't do that. Ideal would be cap chaining with a vargur so the vargur can run a big booster. Domi would use the extra cap to improve its local tank.

If you want to use a maelstrom however, how you fit the domi really depends on what you plan to be doing with the maelstrom. It looks like you're going MJD-sniper route, in which case the 800s on the domi are pointless. At these ranges, tracking is a non-issue and target painters have limited range, you're also not using missiles, so I would not use the target painter. Painters will be nicer to use come Rubicon when they get a 5s cycle time, but its still extra stuff to click on when dual boxing.

-IMO drop target painter, you're not using missiles, and at MJD ranges tracking is not an issue in PVE
-2 omnilinks is sufficient. You won't be using gardes initially, use bouncers/wardens/curators depending on rat type at long range.
-2 free mids gives you some versatility. Remote ECCM vs guristas, remote sebo vs serpentis, tracking links vs others are all excellent uses of these mids. You can also go for cap recharge and use an RR mod, go for an easy permatank on the domi, or yes, a painter or additional omnilink if you feel like it. Keep an open mind about these two utility mids.
-If targeting range is an issue on the domi put a signal amp in a lowslot (or sebo in midslot).
-Lots of options in the lowslots, if you want to go the remote assistance route a CPR in the lows isn't bad. Probably want to shore up your skills to use t2 stuff.
-highslots are whatever in your 4 remaining ones. 350mm railguns with lead is a low-cap way to add more dps and doesn't hurt your powergrid too much. Or 1200 arty. a cap transfer or shield transfer could be pretty awesome, but you could only burst it, and it may not be necessary.
-Rigs are whatever. For MJD support I would encourage CCCs and stay away from resist rigs, as they're better for RR, and having extra capcitor means less attention spent on the tank of the secondary ship (even if you can't permarun the tank). Drone mods also optional.

Assign drones to main ship when shooting battleships, otherwise have your mael shoot cruisers/BCs/BS's while the drones blap frigs (4s target cycle time, will 1-2 shot any frig at MJD range). Bring gardes + 5 of whatever sentries the targets are weakest to. You probably won't have to switch to gardes much at all, and won't want to unless a BS or sneaky cruiser gets within 50km.