The picture is necessary to grasp the concept. At the very least, the picture the O.P. has produced reveals his assumptions about the topology of the Flat Earth, which is not canonical. He is treating N/S and E/W as linear directions, whereas in the FE model, E/W is circular.
It is obviously incorrect that the tides are produced by a simple "seesaw" effect, since opposite sides of the world ought to have the same tides. I have proposed that the Earth's surface is rather vibrating in the second harmonic rather than the first; in this vibration, opposite radii of the Earth (north and south, east and west, northeast and southwest) always deviate from "level" by the same (signed) amount.