If you've done a lot of exploring prepare for hell with Thaumcraft. When you discover new nodes by going to new chunks all kinds of flux kicks up. It'll re-balance after a bit. Also, these things aren't the end of the world generally. You might get an occasional wisp or two, but honestly you chose to have Thaumcraft in your mod to give your world a little more magic, and that's what it's doing. The real problems come when you start dumping aspects willy nilly.