Haha, the AVCS problem led me to the completely wrong conclusion. It's not load limit related at all, and the load doesn't go higher than 1.05ish even with the limit raised:
http://datazap.me/u/tor/tor-205-avcs...zoom=4743-4849
I didn't notice any adverse effect of the raised limit by the way. No hesitation or anything. Which makes sense, since it doesn't exceed the value anyway.
Dip is still there too. So aagun is right, it has to be the AVCS (now that I've driven with it inactive by accident it must be pretty safe to conclude).
Since I have been wrong several times, I am going to give the OL fueling adjustment one more try. I guess the easiest way to find out if the dip is real or not, is to eliminate it as best as possible and observe the effect.
Anyone that can point me to a log from someone with an OpenFlash Header? I would be curious to see how it compares to the Gruppe S.