Yeah, it's too short. Your forearm should be about level in that pose. I'm 5'10" and my single staff is set at 49" from tip to strap mounting. For downhill travel a little longer is good. I tend to go a little longer with a single staff too.
Also, A wrist strap that gives some support will take the load off your forearm muscles and hands. It is easy enough to tie a tubular webbing loop in a Prusik hitch. Your hand can go through with the webbing in your palm as you would do when cross-country skiing. With that, moving the pole forward is just a flick, and your weight comes down on the strap and doesn't require a tight grip. For the loop and Prusik hitch plus some extra, your staff will need to be another 8" or so longer.
I would concoct a cover for the camera screw. If you fall on that, it won't be pretty!