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I have some vintage boar and they are very soft. It sounds like brush abuse is out :<0) I would say a 24mm is a big enough size unless you want a giant. If you like what you have except for the shed...

The shedding may be due to the way you use your brush or who made the knot or just an old worn out brush :<0) Not knowing what you have doesn't help pick a direction. GOT PICS ? The stiffer brushes...