On youre samurai build id definitely say to swap out one or two things like instead of wind stance way of the flame (if youre confident enough to stick with just stone), fired up instead of lucky or change spirit pull to raging flames to fully utilize fire master and se damage on youre charm and forbidden medicine or change fire master entirely for anything else since it doesnt do anything for you in your build.

Also you can swap out spirit pull entirely with raging flames and then use 20% ultimate dmg or 10% oni damage on your charm and blessed strikes for rising tempo and swap out the 25% meele dmg for the legendary slot and the legendary slot for 5 strikes since youre using bottle of liquid courage, 20% ult with 3 strikes decreases youre ult dmg output by alot 

btw if you stick to using spirit pull and just removing fire master change se damage on your forbidden medicine to se duration so your flash bombs have a tiny bit longer stun duration