Hadn't even seen those dials, thanks for telling me. Now the question is: how the heck did I manage to fly for so long without knowing of their existence? Ignorance is bliss?
Well, my trick was to never go over 60 to 70 % throttle... - I guess that helped.
I noticed that I couldn't start when only turning the cocks once, but that it worked like a charm when I gave them two quarter turns...
Carb heat is mainly for going through clouds, I think.