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At 175lbs you WILL break the Squire. It's a grom binding. I'm surprised they even suggested it.
But the guy at the shop is clearly not very onto it. The Stepup is a symmetrical ski, meaning it's made to be mounted at one position only, center. Putting a schizo on it is pointless, as you wouldn't want to change mount position anyway. Hence I would take anything he tells you about bindings with a grain of salt.