Have now put 3 coats of DT Nullarbor Ochre on and think the answer to my question about how many coats to apply was 2.5 !
Here's how the body looked after coat 2 - a big improvement on consistency from 1st coat and almost good enough with only a few minor dry spots.
I let it sit for a number of days and opted to put on a 3rd coat. Has had about 4 days of warm temperature (high 20's to mid 30's) and still does not feel completely dry (compared to 1st and 2nd coat outcomes) as it still exhibits a slight tackiness. Also looks like the DT has pooled in a few places as if it didn't soak in and/or blend in on overlaps. Happy to take any feedback about how the base coat of DT behaves in a multi-layer situation and also happy to hear suggestions about how to remediate any spots where the finish has not fully blended.