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Quick update - I went ahead and built up the restrictor plate this past weekend more or less as described. Difference is I used 1/8" thick AL stock and a couple of longer bolts to securely mount it. The thicker restrictor plate still fits fine with the stock oil feed pipe and is leak free. The other difference is since I didn't have a drill bit small enough for the 0.060 hole, I used the smallest bit I had on hand which was 3/32" = 0.09375". Figured for test purposes, I'd rather flow more oil than less.
Anyway, after a test drive, my smoke screen seems to be gone, and the turbo doesn't sound any differently when it spools up & makes boost. Need to get the car into some good twisty roads and steep hills to see if these results are conclusive in high-G situations though, as my test drive was over relatively flat & boring roads.
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