FWIW (prolly not much!) I did try a set of inner bar ends a couple years ago. Completely understand the appeal (quasi-aero bar position) but they were not for me. I gave them a good try, but couldn't get comfortable with that position.
Quickly went back to my usual set-up: 58cm flat bar w/6 degree sweep; Ergon grips with integrated shorty bar ends. Works for this old man (73).