Bob – As far as I know (which admittedly isn't all that much) composting worms only 'hang out' in the upper layers of soil that contains a large amount of decomposing matter and a high moisture content. This does not describe the conditions found in typical garden soils. Composting worms are considered 'epigeic' – that is, living in the uppermost layers under the conditions I just described.
It sounds to me like you are after 'endogeic' species – these are the worms that live in the top several inches of typical soils. As I think I implied to you in a previous post, "if you build it, they will come". I mean to say that by doing exactly what you are doing and enriching your soil the way you have been, the 'endogeic' worm species will find you. It is unlikely you will ever see extremely large populations of these types or worms – certainly not like we are accustomed to seeing with Red Wigglers in well-maintained composting bins.
I am not aware of people who are breeding endogeic species (perhaps there are other people who do…Mr. Duncan Carver…do you want to chime in here???) – it sounds to me like an area worthy of research and development and a niche market to tap into!
Here is a link to an informative article on composting worms from the County of Los Angeles Countywide Smart Gardening Program – perhaps it will help: http://ladpw.org/epd/sg/tech_s…..c_info.pdf
Good luck to you Bob! Philip Rock