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Perhaps the LANKIT was inappropriate for the movement, and the gear ratios are out-of-whack with the movement, causing the overspeeding of the movement.
It may be beyond adjustment! it sounds like quite a large error in the speed.
Consult with this page, and see if its information on LANKITs indicates that you put in the correct LANKIT?:
(Since I don't know what Lanshire movement is involved, or what clock etc, and what LANKIT was put in it, I can't yet venture to say what adjustment might be tried. Some more information on those points might help me get you information on the matter.)