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yeah, -3 sounds like a good spot for a.m. riding. Keep in mind that the bigger the ski, the further away from center you can go and still have enough ski ahead of your binding to float.
Ex.- on a massive 195 cm ski, you could probably mount 6-8 cms back and most would ride well. but on ski thats only in the 150s or 160s, -2 or -3 will be plenty.