Steve Elliott
Since I do my milling on power equipment I'm probably not the best one to tackle the question of really thick shavings, but here are a few thoughts anyway.

On a scrub plane I wouldn't bother with a chipbreaker. To remove stock quickly I'd be planing across the grain and expecting a somewhat rough surface which would be refined with different planes.

A shaving thickness of 10 thousandths is still very coarse and I'd probably only try it in softwood when planing an edge, not expecting a full width shaving. I haven't tried using a chipbreaker with shavings this thick because my working style doesn't call for them.

For final surface refinement (meaning the removal of whatever defects and tool marks remain from bringing the workpiece to the desired dimension) I would use shaving thicknesses of maybe 3 thousandths down to somewhat less than one thousandth. This is where the chipbreaker is especially useful. A setback of 8 to 12 thousandths is the ballpark figure I'd start with and then just watch the results.

Very fine shavings, like the 3/10,000 you mention, just haven't been useful to me. They remove wood so slowly I lose patience and getting a wide shaving is difficult unless I'm just planing an edge that's narrower than the blade. Shavings this fine are less likely to cause tearout in the first place, as the Kato studies show. I wouldn't bother with trying to set a chipbreaker close enough to be used with this thin a shaving.

I don't have the expertise to recommend a chipbreaker setback for every species or every type of planing, but I've found it easy to get the results I'm after with a little experimentation.