So I had an idea of sorts.

What about Kaiten costing 50 Kenki, but being a Reassemble of sorts for Samurai? The 50% damage buff was originally the core issue, because a non-crit Kaiten'd skill was a feelsbad that contributed to pretty wild variance. But if Kaiten significantly reduced that raw numbers variance, then it could encourage proper Kenki management, and introduce some flair to bursts, and even interact with Ikishoten in interesting ways.