Further update:
1. Replaced injectors with the set that came with the car. . . not known to be good: just doing the parts changing thing to see what happens.
2. Long story short, discovered that the intercooler was full of oil. Interesting, because I had checked it when I first bought the car, and it was clean at that point.
3. Cleaned the intercooler and piping, replaced the pcv valve, pulled the valve cover and sealed the baffles. Also checked the turbo (again): it has NO detectable play in it.
4. Started the engine and drove it a little bit. The valve train was clattery, so I drained the oil. Much fuel in it! Replaced oil and filter, and we've got our car back: runs great. We've now put a couple of hundred trouble free miles on it.
Conclusions: I've been chasing my tail. It clearly originally had the fuel problem, because the oil was full of fuel. I think that either the new ECU or the used injectors solved that, but I couldn't tell, because I still had smoke due to all of the oil in the intercooler. Have I solved either problem? I can't be sure at this point, but I'm hopeful. Time will tell.
We're just happy to have our awesome little Capri back. It really is a delightful car to drive! I'm just sorry we missed the Freeport meet. Maybe next year.