Tact is an interesting one - seems so chunky and mean, but is a bit too gentle to run as a pure attacker. Extending all the teeth with a Sen weight seems to emphasize the defensive aspect as nothing remains erratic in the shape of the layer, where putting Sou in leaves less teeth out to deflect contact away from the top and bottom spikes. It makes a versatile balance bey when I emphasize stamina and competes well with an array of builds. Unite' turned tL into a controllable ridge-rider which moves to the middle to conserve spin after a some early laps and I've got good mileage with Ul' and Extend+. I also added 00 under Expand to bulk it up for KO's.