Please go away with your ignorance about forces, vexatious chappies,
Gravity differences are more complex than you suggest, as it depends where you are, and above what reference level. There is also the rotational/centrifugal/centripetal part to consider.
The difference in time between equally spaced gates from above a Peruvian mountain (equatorial bulge plus a mountain under your feet) against the arctic ocean (polar squatting and kms of low-density water) is as extreme as it gets, but the difference in time is very small. The difference in g, by about 0.7% from these spots is only the same as the difference from climbing a few tens of km. Compare the ratios of the distances to the center of the Earth from the North Pole and antiplanic Peru.
And tourist, perhaps a remedial course in counting is in order, or am I somehow wrong about the intertidal period and the oceanic tidal range?