I just realized I had an XL-235 engine laying around, well not exactly laying around, it was attached to a blackjack.
This was a really great find, because my Cataphract-4X came with a puny standard 220, and that was making it difficult to make a decent build. Those engine heatsinks are important!
This is what I ended up with. I'm pretty pleased with it, even if the loadout is a little weird...
http://mwo.smurfy-net.de/mechlab#i=44&l=0892e8c54d8f544b64a43196a7b52a5d43ffa061Alpha damage is a pathetic 26, but I can fire the ac2s and 5s continuously for a very long time before overheating. If I need more immediate damage output, I can fire the Medium pulses, but of course there's a fair price to pay for that in heat. With just the ACs I put out 11.58 dps, if I add the lasers it goes up to 15 dps.
I'm considering shaving off a ton of armor, and dropping 2 tons of ammo to swap the mpls to an LPL instead. I'd certainly appreciate the greater range, and LPLs are ever so slightly more heat efficient. I've only ever run out of ammo once, and it was a very successful round, so I can probably afford it. Cataphracts are such large targets, especially the CT, so I can get away with shaving leg armor a bit. It would drop my max dps and alpha by about 1 damage, but I'd be able to apply it at a longer range.
The main problem with this build is also what makes it so good for me. This build requires me to basically just stare down targets and pepper them with AC fire, meaning I don't get to do much shielding. The thing is, that's what I've generally been doing anyway... so at least now I'm playing a build suited to it! Still, I need to get better at shielding...
EDIT: The new terra therma is OK, I guess. I'll certainly need to get a bit more used to it, but nothing seems offensively bad about it from first glance. It does suffer from visibility issues in some of the map, against just far too dark for my tastes, especially mixed in with the super bright glowy lava. I didn't realize my monitor could produce the light output of several suns, but apparently it can when I play mechwarrior...