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Wet saws make cutting thick or strong tiles easier, they also make it easier to make multiple cuts on a tile. It takes longer to use the wet stone so if you don't really have to use it then cutting with a tile cutter will go much faster.
First thing I would check is that the table is square to the blade. If the back edge of the table that pushes the tile through the blade isn't perpendicular to the blade the cut will start fine but as you go through the tile the table will be pushing the tile into the side of the blade and cause a huge amount of friction, making the motor work harder and eventually pop the circuit breaker.
First, unplug the jointer, then, insure that all the cutters are set to the same height. Raise the outfeed table with a straight piece of wood or a framing square sitting on it and extending over the cutters. Each cutter should just touch the board without raising it. The infeed table is lowered by how deep you want to cut. Always look at the grain of the board you are cutting. Never allow the cutters to strike grain that is running down into the cutters. It will chip out chunks of wood. The grain should be tapering down away from the cutters, back toward you, never toward them.
The tapering you mentioned usually happens when the outfeed table is lower than the cutter tops.