I asked John directly, and really didn't get an answer so I thought I'ld post here and see what I get.
http://www.kelinginc.net/KL23H2100-30-4B.pdf
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They seem to be substantially weaker than another set of 382 oz motors I got from another vendor.
I am running them on a Gecko G540 with a 48VDC power supply and current limit set at 3.48. (Got the power supply from John a while back with this in mind.)
Any suggestions? All he said was if they don't get over 80C they are fine. Not really an answer to the low torque issue.
The only real descrepency I can find is that the phase wire colors do not match his diagram. Should be no big deal. I found the coils with a meter and hooked all the motors up the same.