The core of Ethereals, fireblades and
FW looks quite good to me, as well as the pathfinders. Plenty of firepower to be sure, and with the aegis (+ space pope's exemplar of the selfless cause) it should be fairly easy to keep them alive. I'm not sure about the bonding knives though; if you're using an aegis defence line then chances are you'll be fairly close to the back, and if you run off it's probably because the opponent decided to kill the 3 of them needed, rather than taking out all but 2. Plus, those 2 guys are probably not going to be worth saving
TBH. Definitely drop the ritual on the squads of 8, it'll only affect them if there's one guy left, which really isn't worthwhile. It might not seem much, but that's 57 points saved already
The riptides look quite nasty, and I have to say that I approve of the Advanced targeting systems. The Stim Injectors are quite expensive (enough for another broadside between them), but I wouldn't want to face a T6 2+ 5++
FNP 5-Wound
MC that can take out any of my tanks or
ICs in a single go either, so it looks rather good for 220pts. I'd just be careful about the fact that they're your only anti AV14, and to do this either have to get close or have Gets Hot!, which isn't great.
As for Broadsides, my first thought is that the bonding ritual is points well spent. The Velocity Trackers and 4 missile drones each look like a reasonable setup as well. They're expensive, but probably worthwhile. I'm not sure whether Monats would be better here or not, so I'll assume you're right here. As for the Broadsides' weaponry, I'd say that missiles are generally a little better, though given your lack of anti- AV14, nerfed railguns might be the better option. Despite the quad-guns, the velocity trackers are still a good idea I reckon.
As for
IG large blasts, you should be able to keep your
FW separated enough to avoid the worst of it while still keeping the squads within 12" of the ethereal (
AFAIK it's only got to be 1 guy within 12" anyway). Or alternatively, just hope you don't come up against guard
Overall, I'd say it's quite a good list, though it does definitely need some better answers to AV14, but I think that most armies you come up against won't like it.