I disagree with a lot of your choices, especially needing to take things like the ghost spells which aren't even that good. You're limited by skill pool size anyway.
In the end you need to make some hard choices but I feel the issue with kensei is not so much putting in the points, but the clunkiness of its offensive skills, I.E. it's mostly stuff where you need melee range or line, overlapping with sidecut and generally other classes like BK having much more utility, flexibility and versatility in their options. Still, putting the max ranks at 3 would probably be warranted
Also you don't need both hirazuki and kagekiri, pick one
In the end you need to make some hard choices but I feel the issue with kensei is not so much putting in the points, but the clunkiness of its offensive skills, I.E. it's mostly stuff where you need melee range or line, overlapping with sidecut and generally other classes like BK having much more utility, flexibility and versatility in their options. Still, putting the max ranks at 3 would probably be warranted
Also you don't need both hirazuki and kagekiri, pick one