I'm all for taking ranged attacks from Shinobi I don't think he needs any stamina buffs though, I run nuke buke and Yama uba which give you stamina and health on successful attacks which is great as long as you land attacks so stamina isn't a major concern, health however is another story it takes alotve characters 3-4 heavies to kill you and considering all of his moves can be punished apart from the near useless deflect that's pretty bad.
I think he should lose the ranged moves and get a free heavy finisher on successful kicks that and increase his bleed by at least 2x and a minor increase to health he would be pretty strong and still not even close to broken without a major rework.