I unplugged the kickdown switch and took it for a drive, then plugged it back in to compare... No change. However, I should correct my original statement as it does NOT hold it in a gear for an excessively long time. It will shift as low as about 1500 RPM and the 3-4 shift will happen even sooner. Full throttle and the shifts occur at about 4500 RPM.

The crispness of the shifts is still VERY harsh at every shift in every gear regardless of speed or throttle position.

It's also a serious dog right off the line, but as soon as the turbo spools up, it hauls! I've read a bunch about an adjustment to the ALDA, but don't want to touch that till I have the vacuum issues taken care of... Could poor vacuum cause this?

Given my revised explanation, does this look like a vacuum issue or is there something else I should be chasing?

Incidentally, thank you VERY much for the QUICK response!
-Garrett