willi297, it might be worthwhile to investigate dedicated log viewers. Log viewing is possibly sufficiently different to text editing for it warrant a specialized tool.
The best log viewer that I found after evaluating about five of them was BareTailPro from Bare Metal Software for $35:http://www.baremetalsoft.com/baretailpro/index.php
I'm not connected with them in any way. I just like their product.