Please be aware that you cannot keep all your piggies in one group - that is a outright recipe for disaster. Whether spayed or not, your sow is still a sow and is perceived as such; neutering also doesn't change social behaviour and personality one bit. Even neutered boars can fight and fall out just the same. I have got the t-shirts!
Never mind that boar trios are one of the most instable boar combinations with fail rate well above 50% and climbing the more teenagers are involved (of which you have currently two), adding a sow into the mix is guaranteed to upset the apple cart without even trying!
I have had several spayed sows in years past; and I can tell you from my own experience that boars react to them just the same as to other sows! The only difference is that spayed sows don't come into season. The other female pheromones are however still produced and are still there to upset boars; even more so any teenage boars and young adults.
Consider which two of your boys are more likely to get on and try to bond them first. If that doesn't work try to bond your third boar with one of the others to form a stable boar pair.
Then see whether you can bond your remaining boar with your sow with one party de-sexed, so you have hopefully two stable couples. But you have to brace yourself that you can equally just end up with one bonded pair or all singles.
Sows past ideal pup-bearing age and especially single sows can be much trickier to bond as they often prefer to come out on top and are no longer keen on sharing. They can also be much more fear-aggressive when meeting new piggies than boars. And from my own experiences with spayed sows, spaying doesn't change their personality, behaviour and outlook one bit!
Place the cage of your upset chirper either next to or between your two other boars for company or next to your sow's, unless he is still on quarantine. Companionship and interaction through the bars is the best way to calm him down.
Please take the time to read these links very carefully. You can save yourself having to deal with the fall-out from a proper mess that way!
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
A Comprehensive Guide to Guinea Pig Boars
Bonding and Interaction: Illustrated social behaviours and bonding dynamics
Neutered / De-sexed Boars And Neutering Operations: Myths And Facts