Firstly, it looks like a scary list. It's very similar to some lists I've built lately so I'll let you know my thoughts...
Personally I'd still not invest as much in the
HQ (even if they do gain
TH from the formation). If you want a bit of split fire, why not include a single target lock in each broadside squadron? The broadsides are already pretty good for knocking fliers out of the air, if you need more
AA then why not get a sky ray to give them an aerial markerlight or two per turn?
Not sure about the loadout of your second FSC either, HRR are significantly inferior to
HYMPs against nearly all targets. Also the HBC on the riptide isn't very impressive unless you nova charge (which will let you down and hurt you 1/3 of the time). It might be a bit less interesting, but a clone of your first would be stronger I believe.
I've found dual fusion suits to be very effective for dealing with heavies and artillery you can't reach. If you dropped one 'SAMmander' you could afford another two solo ones to get behind knights etc and melt things
With a list this static, an ethereal might do you good - morale can be a problem for broadsides and riptides, and stubborn could help with that perhaps?
With regard to maelstrom games, I usually use a couple of units of kroot to outflank in addition to my deep strike suits. Can be quite good for engaging expensive squishy units in the backfield too!
Anyway, hope some of that was vaguely helpful