All I really want is tachi enpi to not break combo's.

Realistically the amount of single target damage required for raid groups to take sams and blm's over a meta comp is so outrageously high that it would cause immediate issues everywhere else in the game. The only realistic solution is homogenizing the classes somewhat like WoW did back in the day so raid utility skills like trick attack aren't only available on one job. If this necessitates a nerf of samurai's raw damage output then so be it. "Does a lot of damage, brings no utility" is a lousy class identity anyway.