Think you're mistaking finishers for crits.  Unless you're doing a move that guarentees you a crit next hit, no dice on that.

Does mean you can swap to a weapon with higher damage for reaction chains, while using weapons with crit bonuses while waiting for a crit to happen though.

Anyway, main things I do is modify my attacks to do /reactionauto first, helps avoid missing crit chains if I'm just mashing buttons.

My second most used macro is one that does jin surge + feet of the fire dragon.