For now, just put the last signature in (I've modified it to be more specific), copy and paste that into a new gmail filter under the "Has Words" field, and then click the search button to test, and see how much junk and how many false positives there are, and we can then chain a couple of those filters together if needed but I will explain that if we come to it
@BlackShot - Edited these instructions, sorry about the confusion, been tweaking the filters to get lower false positives for you
@Fantasy - Try this also and let me know, I will try to help you too with the tweaking