In the late 90's it was 14ft lbs. I have never looked up anything over a 2000, and doubt it changed.
On the knock settings, please do the reading on HPT or DHP sites (if it's up) about it. There's pro's and con's as well as some info that guides you to what folks have tried and liked/had issues with etc.
On the KR at the shift point, there's even more settings on various things relating to torque management etc. GM in the programming injected knock at the shifts to reduce power and be nice to the trans. That may be your shift kr that you see. Even something as simple as calculated torque/power can upset the tune if the tune hasn't been setup properly.
