Yes if it's possible that you can bring your bows inside to a more stable controlled environment that would help a lot.It does here.Even though it is sealed though over a period of weeks humidity can creep in eventually.I've tried a lot of different sealants.Linseed oil,tru oil,tung oil,bees wax,parafin,polyurethanes,magna lac[lacquer],now I'm using some products from a company called Cabot.They are pretty well known.I use a compatible sanding sealer twice,then 3 coats of satin spar varnish.It is softer than magna lac and takes approximately 2 days to dry.Magna lac dries in an hour and you can be shooting your bow.All work good.I'm partial to spar varnish right now.
Sounds good to me about the swap sometime of staves.We'll find out how far apart we are from PM messages.