Yeah I actually have a pair of 181 ar6's (well technically not cause I just sold them but there still in my possession). I mounted them at suggested and found it was more then mine. A lot of people these days seem to love true center and that's preference I guess but I find the reward you get for the slightly better switch abilities isn't worth giving up the all mountain performance that you loose. So I would say anything less then 80% park, go suggested, between 80-95% park go -2ish, and if its 95-100% park then maybe center. So yeah, as far as bindings go I would need a lot more info to make a recommendation, maybe make a new thread.
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