Traditional merit scheme:
Group 1 -
5/5 Store TP
5/5 Meditate

Group 2 -
5/5 Overwhelm
1/5 Shikikoyo
4/5 Blade Bash

With recent changes to Hasso and Zanshin, there are other merit builds that focus on capping Zanshin rate and Ikishoten. Haven't done much with it myself, but there's some info on BG and I think in some threads here.