I knuckled down today and worked my way through the next batch of test painting. The figures I used were all 1st Corps.
Even while I was painting them I realised that some of my colour choices weren't quite right. After applying the soft tone wash, I concluded that for just about every element I am better off doing a single step of either the base, the highlight or a mix of the two followed by a wash and then highlights where appropriate (either the original colour or a mix of the original and a lighter colour). There were some colours that were too dark and some too light - I'm either replacing those or changing them to a mix for my next test batch.
As for this batch, although they aren't perfect they are good enough. A bit later tonight I will be painting the ground texture on the bases. Tomorrow, I might give them some highlights then varnish them and put them to one side for selling on at some point.
When they are done, I'll re-black the previous test batch and get another batch out to test my new revision of the scheme.