Well I wouldn't reject it out of hand Michiel, but I also wouldn't bother to remove my chaincase if I had to reset my timing. But definitely worth thinking about during a period of engine rebuild. Especially after you've done the groundwork to prove that it works perfectly :relaxed:
In your first paragrapgh you say you did the ciggy paper thing then adjusted the max gap to 12 thou. Its the other way round. Set the max gap first otherwise the one will undo the other if you know what I mean.