Hi Nick,
You have the Sine and the Direction icon active on each, I assume. I believe you checked with the step size of one and got more than the two expected directions.
Let us stick for a moment with the step size of one. This means out of a large number of angles for each axis, we expect to get two (let name them a and b).
We have three-axis for each object. Each axis receives a random value. Now we split this in either value a or b. Which means, we get for axis R.H perhaps a, for R.B again a and for R.P this time b.
Which would result in aaa, aab, abb, bbb, baa, bba, bab, and aba. (two to the power of three = eight). So we have with the Quantize setting of just one, already eight different directions.
Any number greater than one will result in an even greater number of directions of the Clones, even Quantized. A level of two steps would result in 3^3=27, or three steps 4^3=64. I think 64 is already more difficult to differentiate from a non-quantized field.
If I like to quantize clone directions, the Fields are not needed for that, this can be done with Effectors directly. Fields work like an area (hence the name) and on direction fades into the neighbor. Yes, one could adjust this, but it might be an effort to keep the borders in sync while not having a clone sitting exactly on such a border (if that is avoidable or even produce at all).
Let me know what your target is, and I might get a better idea about the options.
Cheers