Bucks Fighting, what can I do?

We are having a big problem with our 2 bucks arguing at the gate. We have 2 separate pastures for 2 different breeds. There is an electric fence dividing the 2 pastures, but there is also a small gate that doesn't have the electric wire. We also have barbed wire running along the bottom & top of the fence. Our fence wire is also small, so they can't get their heads through it.

Well, our Boer buck & our Myotonic/Fainting buck keep butting heads at the gate. They keep making a sneezing/farting sound with their mouth, lifting their lips, jumping in the air/butting heads, hitting the gate so loud I can hear it in the house. Our myotonic buck even fainted a few times after butting heads with our Boer buck. It's making me nervous that one of them (especially our big 300+lb Boer buck & when he stands, he is as tall as the fence) will get into the others pasture & start seriously fighting. Plus I definitely don't want our Boer buck breeding our myotonic does (it can kill them).

Many years ago when we first started raising Boers, we had 2 bucks in the same pasture (we didn't know any better). Well they fought so much until one of them broke the others leg & we had to put him down. We NEVER again had 2 bucks, ever, at the same time until now (even though they are in separate pastures). We didn't plan on having 2 different breeds, it just happened... we took in a friends fainting goat she no longer wanted & it went on from there.

Our bucks have been doing this on & off for a while now. We tried spraying them with water & using a hot shot, but nothing works. When we got our Myotonic buck he was rutting & our does were in heat so he bred them all. After he bred them, everything calmed down. Now they are trying to breed the does again & the 2 bucks are arguing again. This year we only had 1 doe from each herd actually have babies... 1 boer doe had 2 kids & 1 myotonic doe had 1 kid. I find this odd because we have been raising Boers for a long time & every year we have lots of kids, but not this past year... I don't know if it's because the two bucks are more worried about each other or if the does just missed or something.

To stop the bucks from butting heads at the gate we now have our myotonic goats in a small pasture far away, where they can't meet at the fence, but it's not enough land for 8 goats & our feed (and money) are going down fast. We have been debating on whether or not we should just sell the Boer goats (we only have 1 Boer buck & 4 Boer does right now & one of our Boer does is 12 years old). Me & my husband seem to constantly worry & argue over this. It's time to either sell them or find a way to make the bucks get along... or at least not be able to get near each other. Right now they can't get to each other, but they can see each other... the 2 bucks keep standing at the corners, looking at each other, not worrying about their females.

Anyone have any advice on what we could do? If not, it looks like we will have to sell all of our Boers. We have done everything we could think of.