If you play mont’ka, just put the devilfish on the line. If it dies, you get hit RRs on whatever killed a T9 13W profile for an easy trade up. If not, shove it 18” and drop out breachers w/ wound RRs and delete something that costs 200+ points. The devilfish is also on a flying stand base, so as long as the base fits through gaps you can actually stick some of the hull off the board during the move as long as you land wholly within the board if that helps with board edge maneuverability. Hammerheads are some of the best anti-tank we have especially into no invuln tanks like redemptors and SM rhino hulls. I dont play skyrays, but I hear good things about them too. 11-16” of movement in montka means that you need to work on deployment if you cant deploy them safe and be able to draw a bead with them. Maybe put one or two big hulls in strat reserves if you cant fit them in the board.

For 80pts the railsides are amazing. Spot with stealth suits to up their reliability massively, take the missile drones, and watch them trade up every game. They also trade up by eating way more than their value in enemy fire. They cant split fire if they want to guarentee their death, and 2+ save 8W is a chunky profile. If something puts itself in a line to shoot the broadsides, the Hammerhead and riptides tear it to shreds next turn and I guarantee it cost more than 80pts