Hey there!

I need your precious advice on how you break in your chains for track use.

I have two loose spots (when the cranks are at 2 and 7 o'clock) on a new chain I just installed.
The chain only have a couple of sessions on the track and it's already messed up.
The whole drive train is now making a loud creaking noise under load + I have to keep the chain tension low for the tight section of the chain.

I tried to rotate the crank 90deg. with the chain unengaged but it doesn't seems to help...
Note that when the chain was new, there was no tight spot so I'm sure my drive train is not warped it's only the chain that lack a proper break in.

Zen ring
EAI cog
Vertex chain

Any tips would be more than welcome!