I am scanning Moly surfaces (sputter deposited, 1 micron thick). After each scan (1 x 1 micron), I can see the tip degrading before my eyes. I tried 'let set point' technic etc, but to no avail. I am using the TESP tip. I have a feeling I need a harder tip. Does Bruker offer nice tips ?? At the same time, I cannot have a blunt tip (sharpness