Max stats aren't always the best way to go. I'm assuming Lacey and Amy are the only two girls in the gym and Amy is wearing her skimpy red bikini. Having completed the scene already, the hearts indicating the stat levels don't show, however reading the trigger/requirements Lacey's horniness or lust has to be high, not necessarily maxed out. What do the hearts indicate? Backing down the stats a bit might help.
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Other than that, the only thing I've got, is that Amy is so pissed at you for continually asking about the dumb quarterback, she refuses to help you in any way shape or form. Good luck.