Originally Posted by
ternitoff...
It could also be uneven chainring wear. Always skid and trackstand with the same foot forward?
Sorry this is nonsense. The only thing this would cause uneven wear to is the rear tire, depending on the skidpatches. And again, the lower limit of chain tension is one where you can push the chain off the chainring/cog. If it is that lose you can be guaranteed to drop the chain on bumps.