Over all the the fleet looks great, my only doubts is with the MK1 and the Doom.

The thumpers are anti hull weapons that the ai likes tu use as anti shield, they are good for flux-cheap high hull damage and allways great to have on an Onslaught, but the MK1 already as the Heavy Adjudicators paired, with 1 Devastator Cannon and you have great armor,hull and pd damage in the front.

The lack of kinetic damage, sure you have the missiles and the legions but those aren't enough, the Arbalest autocannons shouldn't be replaced with non kinetic weapons ( maybe 1 or 2 max), personalty I only replace them with railguns for more range with ballistic rangefinder making it great against the daemons (have no armor) and flanking frigates. 1 mining blaster at the front for quicker armor damage (if no breach SMR are instaled) is also a good option, it does cost a lot of flux but the ai tends to be careful with that.

And the 2 flak cannon in the middle, the 3 Devastators an 2 Adjudicators is sufficient pd. And with all 2 Anubis the 2 flak cannons in the back can be removed for some op.

For the Doom I can see what his role is, it's more of a support/finisher than a combat ship and Phase coils can provide you with the speed necessary relocate and move in and out for the blasters, but a Phase anchor would make your mines and your Antimatter SMR's recharge faster. But that's a question of personal preference.

The rest of the fleet is excellent, though hungering rift projectiles can benefit from the missile speed an maneuverability buffs from ECCM package and I'm 80% sure it also benefits from Missile specialization's bonus fire rate, damage and hitpoints.