Whilst flipping through the FAQ, I came across the origin of tides according to the FE model, namely being the see-saw effect of the Earth. However, one can make an observation that causes a problem under this model. High and low tides are more extreme at the equator. That is: that a greater volume of water receeds at low tide from the equator and a greater volume of water accumulates at high tide. This is unique to the equator but does not make sense under the see-saw model. Using the see-saw model, we would expect the greatest volume of water near the ice walls with very little tidal variation in other regions.
Oceanic currents in the ocean also do not support this notion as we would expect to see currents constantly going around continents. Instead, the currents seem to be going in a circular fasion. This could be explaned by a rotational movement of a non-level flat Earth, however it does not adequately explain why tides are higher and lower at the equator. We would still expect the highest and lowest tides around the ice wall with the equator seeing almost no tidal effects.
Another potential flat earth model is the following: a rotation of an unlevel flat earth in addition to a perpetual elastic ripple from both the north pole and the ice wall. These ripples would have to be synchronous, so when the north pole is elevated, the ice wall would have to be elevated and visa versa. While the ice wall is off limits, we can travel to the north pole and see if its elevation is changing every 12.5 hours. However this model has another flaw. Extreme tides seem to travel around the equator and not occur simultaniously (which is what would happen in the model I have suggested.)
We would need a different model. Here's the only accurate one as I see it. We would need a different kind of elastic ripple. One originating from the north pole and spanning the entire radius of the Earth to the ice wall. It would need to move counterclockwise for half the earth in the span of about 25 hours. There would need to be two ripples coming from the north pole. That way there would be a 12.5 hour delay between high and high tides on both sides of the Earth. However, this model is not yet complete. We would need to assume the earth isn't perfectly flat. We would need to assume it is sloping inwards towards the equator and that our elastic ripple is enough to overcome and exceed this slope. The reason for this is because tides are so much higher at the equator. A change in your elevation would certainly be measurable, especially when it comes around every 12.5 hours. However, we have more problems with this model. While it accounts for tides, it still does not account for currents. An unlevel rotation doesn't quite account for the currents in this model because our ripple upsets the balance needed to sustain circular currents.
In conclusion, tides are an extremely complex thing to explain using the FE model. I was unsuccessful as there are problems in every model I suggested. Every model I suggested far exceeds the current model of FE tides because the current model of FE tides do not match our observations of the Earth.