Ah, gotcha. I've never muled boxing that way, only used it a stepping stone to defensive powers.
Pulling 4 slots from boxing and putting them in UnGrd gives 15% Toxic/Psi and 27% Mez, plus 2 slotting Mako gets me an extra 1.5 Toxic/Psi and 2.5 Mez. It puts Psi in the red and Toxic over 50.
But while the original slotting gave the build gave only 6% Toxic/Psi, I'm losing 10% Recharge, 4% Rec, 15% Acc, 20% Mez, and some extra Fire Cold that I don't really need. I need to at least 5 slot it to get the Recharge, and then the sixth slot gets me more than moving it would.
Hmm...thanks for the insight on that.