Didn't really get that far with this one, but the only thing that immediately occurs to me that doesn't run afoul of the idea that each Primary Stat represents two opposed concepts, would be handing out advancement points in those three flavors depending on what it's earned for. You could assign the gain to either of the linked Secondary Stats (and probably have a trickle-down effect to the skills like in YAPPIE/YIPPIE/YORKIE/whatever name it is this week) after applying it to the Primary Stat, but not the other two Primaries or their linked Secondaries.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows