Have you looked at group 026? I think that's the actual knock voltage if I am reading this correctly: http://www.ross-tech.com/vag-com/m_blocks/

Do a pull with groups 010 and 020 to see what your actual timing advance is while also looking at timing correction. Just curious.

I can bring my compression tester with me to Jake's this weekend if you need it (but he probably already owns one).

Do you have the compressor for the rear chain tensioner? Makes life 20x easier, albeit I don't own one.