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Cray Wanderers will have to settle for the Ryman League Division 1 South play-offs after losing 2-0 at champions-elect Kingstonian on Easter Monday.
Simon Huckle stretched to open the scoring in the 14th minute before Max Hustwick doubled the score with a 27th-minute header.
A late equaliser from Dave Cory for Whitstable dented Sittingbourne's outside hopes of reaching the play-offs.
Hichan Khazzan put the visitors ahead in the first half before Cory scored after good work by Gareth Cornhill.
A goal from on-loan Gillingham youngster Jacob Arnold-Smith handed Folkestone a 1-0 derby victory over Ashford.
Chatham were held to a goalless draw at Thamesmead in Division 1 North.