Greetings, your list has a solid core, and glad to have helped with the idea.

My critique:
1. You need some crowd control potential. Why not give your Shas'
el an airbursting fragmentation launcher? I think its almost a mandatory piece of wargear in a gunline...something to thin hordes out. Your list will absolutely wreak havoc with
MEQs and necrons, which is what you'll see the most of, but if you run into Tyranids, Orks, or other swarm armies, you need the ability to throw down a large template here and there to cull the ranks.
2. I don't favor markerlight drones in crisis teams outside of a Farsight Bomb; you only have 5 models in a crisis team (with two drones) and its too easy to take down that markerlight drone, costing you a significant 30 points. I tend to go with shield drones with my forward crisis teams because they're GOING to take fire. Hopefully they'll be in cover when they're taking fire and benefit from cover saves in addition to 3+ armor saves. If you want marker drones, put them on the line with your firewarriors instead of gun drones. You'd be surprised how little firewarriors in your own deployment zone will get shot at. They're not out stealing enemy objectives, and they're not as much of a threat as Ap1 and AP2 death jumping around in the face of your enemy....they get ignored a lot. If you put them in cover (ruins are great!) then you're almost broken in how awesome they are.
3. Speaking of markerlights...you're going to have to practice with those handheld markerlights. They aren't networked, so the immediate unit they are attached to doesn't benefit from them. Keep that in mind.
4. Speaking of more markerlights....those Fusion/Plasma combos are DEADLY. However, crisis suits have BS3. You have to make sure you have reliable markerlight support to make them hit on 2+ or 3+ to insure that they're doing their job. Pathfinders, networked markerlights on a firewarrior line, a skyray with markerlights, handheld markerlights....a lot of ways you can do it, just make sure that you do.
5. Broadsides: Don't waste the points on twin-linked plasma rifles. I think your broadsides are missing a third battlesuit option? Typically folks either take a multi-tracker or advanced stabilization systems.....pick one. If you deploy your gunline well, your broadsides will be protected by the rest of your gunline, and there should be no reason for them to be trying to pop terminators on your gunline with plasma shots....that plasma would be wasted against anything else other than tyranid monstrous creatures that get past your elite choice screening line. Save points, go with the smart missile systems.
6. Objective taking: You don't *NEED* to go out and take objectives. You need only deny the opponent their objectives, which suits can do just fine. Honestly, tabling someone works too. In capture and control, you will own one. In seize ground, you're going to get to place 2-3 objective markers to make 3-5 objectives on the table. You can position them so that regardless of which side you get, there's an objective in your gunline, and one in the middle in WIDE OPEN GROUND (if possible). Objectives in the middle in the open are great killing zones.

Play a few games, see what happens. Some folks feel the need to mech up and put devilfish forward on the field....I prefer to leave mine in cover in my back or midfield and use them as a firebase until the end of the game.
7. Pathfinders would benefit you because they would let you deep-strike suits if you need to. Nothing messes with
MEQs or necrons more than suits with freakin' plasma/fusion rapid-firing into them. Two teams of them is just unfair.
8. Use an Ionhead instead of a regular Hammerhead when you're not taking Fusion/Plasma teams and you need long range
MEQ killing power. Ionheads work best (
IMHO) against Chaos, who have more of a tendency to field things that you can actually knock down with them. Necrons too, although against necron players, I'm a big fan of sniper teams.

Adding sniper teams to your current list with the modifications I listed gives you a pretty guaranteed win against necrons; even swarms of scarabs will fall before your shas'
el.
9. As for taking a devilfish or a hammerhead somewhere....try it and see if you like it. I don't mix and match mechanized and gunline for a reason: Every player (including you) takes a mix of anti-infantry and anti-tank. When you have no vehicles, all that anti-tank goes to waste. How would you feel if all your six broadside suits had to fire on each turn was a space marine squad? In cover?
Anyway, that's enough from me for now.
Aside from that...that's my advice.