So, it looks like there is a bug that causes the mana fabricator to keep creating mana even when all the power is used up, I'll see if I can find a fix for that. As far as the Ignis Incinerator, it costs 120 Ignis to process an ore the first time and 320 the second. You are correct that this is significantly more than Thaumcraft uses, but I think the point of the Incinerator is that if you have all three magic mods it can give you 7x the output. One ore can produce 7 ingots. With the node fabricator, you are getting a hungry node because you put too much Auram and Vitium in them... There are some complex rules about how much you should put in, but as a hint.... Try putting in exactly 109 of each Auram and Vitium. BTW, you can create any kind of node with the wrong amounts, including tainted... so be careful!