I seem to have small to medium size hands and find it extremely difficult to control the graver when either the handle or the graver is too long. Therefore always use the "mushroom" style handle and have been known to cut graver blanks in half before mounting them. Guess we all have to figure out what works for us.
While the handle appears to be nicely crafted, it seems to be counter intuitive, to me. I use the airgravers, I find their diminutive size to be a plus, and if they were to alter the size I would want them to be even shorter! Not even one time have I ever wished they were longer!