The above spec is correct, as is most of the advice. However, you should not get above 40 heat almost ever. That's just basic BH mechanics. If you get to 75 you better have Vent Heat ready.
For AOE packs, a DFA following by charge, carbonize, FT (should be able to hit them all for at least a tick or two), Oil Slick, Flame Sweep and start tabbing.