I have read and heard KYB mounts are junk and I think that mine are going bad. I was also thinking the design of the bellows might be junk because they integrate the bump stop into the bellows. I think this is creating an issue because the top of the bellows is metal. I would think it would be better to use a bump stop like what Monroe sells, because seems like the strut shaft is better protected.
The only reason I started thinking about this was because of this image on ZZPs site. I might take mine apart and use some new mounts and this style of bellows and bump stop:
Instead of this: