But it's much more consistent. I'd rather have 20 points of damage every turn than a 30/15/30 pattern. Between that and the superior range brackets of ER PPCs when linked into the C3i, it makes the THG-12E clearly comes out ahead, IMO.
First off, it has 14dhs, so it would be a 2/2/1 (30/30/15) pattern, assuming you've found your spot to
snipe provide fire support from.
That's what I though at first too, but think about it: 2 HPPCs + 1 Small Laser + Running is 33 heat. Or you could do 2 HPPCs + Jump 5, which is also 33 heat. So you can easily maintain constant TSM heat while firing both your main guns continuously, making it effectively a 4/6/5 'Mech with the same primary armament as the LGC-03 and better backup weaponry.
33 gets you there, but then on subsequent turns you have to stay heat neutral or hotter to maintain the TSM benefits, and with 12 dhs, that's gonna leave you in a 2/1 (and other stuff) firing pattern. Also they're improved jets, so the heat should be 3.
This is what I mean:
Turn 1: 2HPPC's and whatever to get to 9 heat.
Turn 2: 1 HPPC and whatever to stay neutral, or 2 HHPC's, which leaves you at least 15 heat. Oh and don't forget this turn's fire is at a +1 because of your 9 heat.
Turn 2+: repeat as needed 1HPPC and a heat neutral firing solution or another +6 (or more) for firing 2HPPC's and whatever you may be doing.