when you lift the top up off the machine, about 3 inches forward of the fill flume is the automatic overflo unit that connects to a tube down the outter tub to the base....this only "activates" when water reaches the very top of the outter tub, a siphon action is created and removes about 2 inches of water.....the water would have to be above the filterflo flume before this would actually activate...
now, if your having water splash out during the spin, you have to investigate where the water is coming from, because it could be the top seal, which may be out of place from removing the top or just not sealing along the top
in the mean time, rather than stop and start the spin, reach in and hold the tub so it won't spin while it drains all the water out and then let go to allow it to spin....sort of a neutral drain......
now, if your having water splash out during the spin, you have to investigate where the water is coming from, because it could be the top seal, which may be out of place from removing the top or just not sealing along the top
in the mean time, rather than stop and start the spin, reach in and hold the tub so it won't spin while it drains all the water out and then let go to allow it to spin....sort of a neutral drain......