When I can see the sea-sky horizon cutting the sun as it sets.
At sunset we observe the sun apparently descending into the earth. This is an illusion in both FE and RE models. The sun does not really set into the sea.
We see what you are attempting to prove a globe earth by pointing towards what is an illusion in your own model: a non-argument.
When I watch a focault pendulum move
A moving Foucault Pendulm, what does that prove? It proves that the pendulum is moving. I'll agree with that.
We see that by your own admission that the pendulum moves on its own accord, when on a globe earth it would not move; the earth would move round under the pendulum while it swung stationary.
So what moves the free swinging Foucault Pendulum at one revolution per 24 hours? To answer that we just have to look around us and figure out what else moves and rotates around us at one revolution per 24 hours. The stars and celestial bodies of the skies comes to mind. Therefore we see a correlation; through gravimetric connections and bridges the free swinging pendulum is able to lodge itself into a gravitational gear and move in tandem with the stars and celestial bodies of the skies.
The Foucault Pendulum proves that the stars and celestial bodies have a form of gravitation, that they rotate above us at one rotation per 24 hours, that if we ascend up in a plane and measure the level of g it will be modified by the gravitational output of the stars. The Focault Pendulum predicts that we will experience different levels of g at different altitudes.
Wait on the south pole! Which can't and doesn't exist on a flat earth?
The South Pole on the Flat Earth would be a circle of land beyond the Ice Wall where the magnetic field lines are vertical. It is perfectly possible to reach the South Pole on a Flat Earth.