Venom Veiler. Combined with the high defence of plate armours, you'll be able to take very low damage from enemies.

Since your damage output will be relatively low, you will also need Venom Veiler when there are healers nearby.

Another alternative is either Volcanic Pepperbox or Iron Slug. The former is incredibly powerful, but the latter is kind of fun and definitely fills your "weight" requirement, in that it's clunky and hard to use. Correctly used, you'll be able to make gremlins to backflips, interrupt a whole lot of enemies (I mainly interrupt slimes and turrets), and snipe things at a (relative) distance with the charge attack.

You have not chosen an easy path. You have not chosen an efficient path. You have, however, chosen an awesome path. Care to join a guild? Shard Squad is always looking for plate-mail wearing troika-swingers.

I'm too used to CTR. I wouldn't recommend bombs without UVs or Volcanic Demo.

Poke-Rock, in case it's not clear, we all know that you're talking about 2-star gear. But the people on this forum almost always talk about 5-star items. Why? Because you should always plan in terms of 5-star gear, because that's where everything ends up (unless you're making a set specifically for Tier 2 Lockdown). You don't want to pick nice 2- and 3-star items, only to learn later that they can't be upgraded, or that they upgrade to bad 5-star items.

So read the wiki, ask questions, and get advice about 5-star items. Once you've chosen some 5-star items, look back in their alchemy paths, to figure out which 2- and 3-star items lead to them. And be patient.

There is no sleep in the game, currently. So don't worry about getting slept by monsters.

Among the Plate sets, Volcanic is a good choice. When you get farther into the game, you'll spend a lot of time in Firestorm Citadel. And Volcanic Plate protects against exactly the threats that you find there. It's too bad that it slows down your attacks, though. Your Sudaruska/Triglav, if you keep using it, is going to be *slow*.

Not really, fast attacks hit first and interrupt yours, so you'll never unleash that great power you have.
Will work on some monsters, but you'll suffer against fiends or other players in LD.

Volcanic Plate is pretty much the better between the two, yes. Fire and elemental threats are everywhere, while Ironmight doesn't even have a second status in addition to stun and enemies doing piercing tend to not be very threatening.

Sleep hasn't been in the game for somewhere in the area of two years, so I wouldn't base too much of your gear decisions on how resistant armours are to it. Stun, on the other hand, is found in a lot of places.

Volcanic Plate is good for Lord Vanaduke, considered to be the final boss. His mace deals a hefty amount of normal damage, stun and fire, exactly what Volcanic Plate protects against. There are also fire tiles there dealing elemental damage. Basically, when you see any piece of armour named "Volcanic", it's meant for Firestorm.

Bopp's also right that wearing full plate while using a Troika is slow. You already knew that, of course, since you're already doing that. In Tier 3 that means you'll have to play very defensively and time your attacks carefully.

And Shard Squad is not even a remotely Lockdown-oriented guild. Lots of our members joined us when they were 2* (this technically includes both of the guild's founders), and some of them still are.