I'll chime in because my school is sorta the same. Spring usually has more people who are friends of the new guys that join rather than random people. It also might have people who got a bid in the fall but decided not to join. I would turn to your new guys first and have them get their friends out at your rush events as a start.
Edit: All though if your reputation on campus is bad/shady, that could be affecting people that join as well. Which in that case there's not much you can do about that.
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