How to reduce suction on waterstones?
I've had lots of airtime and help recently, but here goes again.
It's becoming clear that wider flat backed blades (plane blades, wide western chisels) develop quite a lot of suction on waterstones once they truly are flat (on Shapton professionals in this case) - far more so than hollow backed Japanese chisels. To the point where a double sided tape attached block of wood as a handle is advisable, and even then it's pretty hard work.
Especially on the finer grits, and a bit more so on the 2,000 and 5,000 which seems to have a much harder matrix. The 1,000 and 12,000 for some reason less so. Adding more water makes quite a difference with japanese chisels, but flat backed blades seem to more or less instantly squeegee it off the stone. The problem is not sharpness, the edges produced seem fine.
Guess I'm wondering if there's a fix, or a cause. For example might it be related to the grit of flattening stone? (400g Atoma diamond in this case) Might a nagura help for example, or some detergent in the water? (think i saw something about not using a detergent with Shaptons)