Either get an Ez lap 26F diamond stone and ware it out a bit before using it for slurry.
Either stick to making slurry from a softer coticule slurry stone.

I often runninto this problem with hard jnats...you want to use the stone's slurry but cant get at it with a tomo.

So I currently use a well worn out EZ-Lap 26F 600grit(@1000 after 5 years of use) that does not dropp any grit. This is my go to tomo and slurry stone