Ok thanks sounds logical. I have a 135mm dropout but didn't knew that cranks can be or should(?) be desgined for that. Seems like I have to get some extra width spacers for trying out. My 2.5mm spacers variations didn't gave me any config in wich the chain didnt drop or make bad sounds.

Oh and is there a easy way to notice if you have to many spacers? I noticed when I go for the rough torque spec. my BB builds up resistance.