I agree with above posters. Unless there are very compelling reasons (show record, good pedigree, great confo) they shouldn't be left intact. They will live a happier life and you as well because they will be easier to deal with, typically more calm, less concerns with keeping them and having proper set up for stallions, etc.
I'd get them cut first and then seek outside help to get a handle on them. The situation as is sounds like one that could get very dangerous, very quickly.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.