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Thanks Diesel911,
I think I have the problem solved. A faithful friend brought a stethoscope to locate the responsible cylinders/injectors and it turned out to be only one. #5 had a pronounced knock at the RPM that was most prone to elicit the nailing while all the other cylinders appeared to be the same. Once I determined that there was only one misfiring cylinder, we jumped in the car and drove to the injector shop where I originally had them rebuilt. Took the #5 injector out and gave it to the shop owner. He invited us to come back and watch him pop-test and verify opening pressure. It consistently showed 121 bar. He remarked that it was off, but that "it shouldn't be a miss." He offered to disassemble and reset the pressure. Readjusted to 140 bar, I re-installed the injector/line and the nailing went away. Just goes to show that you have to make sure of injector adjustments, and that if you are having someone else rebuild them for you, a trust relationship is valuable.
Car runs like it should now.
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