[heatmizr]

Peter, I can't tell from your post if you are doing the valve stem seal idle test correctly. Its not during idle that you would ever see smoke, its after idling for a good 4-5 mins, then stomp on it. The oil accumulates during idle and then gets burned under accel.
Just checking.
Look for other post on here somewhere by Sophisticated Redneck, I think he also advised someone to check their turbo return lines to see if they are clogged (check for yourself, I don't know that I understand it 100%).