As the clock hit zero at Adelphi’s Motamed Field on Sunday, Dropkick Murphys’ iconic hit song, “I’m Shipping Up to Boston,” blared as fans lined the bleachers with signs spelling out the city’s name.

Gordon Purdie was pleased. But not satisfied. “It does not feel that way,” the Adelphi coach said when asked if his team had put forth its best performance of the season. The No. 1 see Panthers routed ...