what I did for my alt monk was give him d8 unarmed strikes (with flurry and the bonus attack still using martial arts die). So no more quarter staff problems.I'm tempted to make Stunning Strike be 1/round, and impose disadvantage if you triggered it on a critical hit.
I then changed the stun to once per round, but at no ki cost.
and lastly made patient defense a reaction, so it stacks with other ki uses and the monk can use it when they know they need it as opposed to guessing