Try this. From your description, you have the coolant at a level that it has found on its own, low enough not to overflow, high enough to connect between the head and radiator at the top. All that's good.
Since you seem intent on it, drain it. Measure what you get out. It should be about 13 quarts, or 3-1/4 gallons. If it's anywhere near that (and allow for a little bit to be in low spots inside the botor and radiator), you do NOT hve any major accumulations. If you were to only get ten quarts, that would be another matter. If the thermosiphons accumulate sediment, it tends to be toward the rear of the water jacket around the #4 and #3 sleeves, and toward the rear of the head.. The best solution to that, if you should find it to be the case, and since you are gettin' handy at pullin' the radiator, is to pull it once more, and the two cast connections to the motor, and goin in through both of them with a pressure washer nozzle to break up the mud and rinse as well as possible. Follow that up with a couple of good hot flushes like is described in the owner's manual, first with washing soda, and then a plain water rinse. before refilling with an antifreeze/anticorrosive coolant.
But honest, I wonder if you aren't expecting something from this system that it doesn't do. If you get three gallons or better out of it and it isn't overheating and you know that your probe works, I'm not seeing a problem in need of a fix. They are notoriously cold-blooded. A system with a thermostat, with or without a water pump would be a whole other matter.
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