As it turned out, Octolapse wasnt the problem.
I tested a print with and without Octolapse and both got screwed up (while without it, there werent as many strings to the side of the print, obviously)
Which concluded: my overall print settings werent tweaked enough for PETG.
After some trial and error, i found out, that by adjusting the flow percentage i got rid of most of the excess filament oozing.
Silver lining though: we now have brown oozing filament IN the prints, which neither looks good nor is an idicator for good printing settings.
But: I already have an idea about what is causing it: The standard replica hotend shipped with the creality printer and the shrinking and expanding of the nozzle, which causes leakage at the heater(area) and then onto the print.
Next, I´ll try to lower the temps and or increase the retraction length to counter the oozing.