With regards to the boar glue being stuck, I don't personally know of a way to get it out, I personally leave it until the hair has grown away from the body a bit then snip it out with scissors.
It sounds like Fudge is extremely hormonal, however neutering rarely makes any difference in guinea pigs and can be a bit risky if you vet is not cavy savvy. How old are they at the moment?
There are several options, you could try them living side by side for a while then see about reintroducing them.
Long term, you can either continue them living side by side if they decide they can't live together or if you have the space for more pigs, possibly get each boy a new friend through boar dating at a local rescue.