There is topic about group 4 cam in marketplace and thought at I'll not comment in that advert. I have used some different cams on my N9T engines and find some solution on regrinded high lift cams usage. Cause cam is grinded from original it needs more adjustment distance and when cam is grinded close to 9mm lift, adjustment distance is totally used. There is some solutions for that. 1. longer valves. 2. longer adjustment bolt or 3. valve caps ->
http://vwparts.aircooled.net/Hardened-Lash-Caps-for-8mm-and-9mm-Valves-8-p/4029.htmI have used these valve caps cause easy install and cheap and easy to find.
V-M
P.S if someone is interested on re grinded cams (any profile) or/and new original sets of rockers, sent me a pm and I'll give more info