Actually never mind.

Just going to leave this chain like it is for now. Order a new cog. And then swap it out next week when it comes. I will get another chain too, they are like $10. Then keep the one I have now for backup. And the surly cog is $20. So that isn't too bad really.

Dying to see what a new chain + new cog feels like.

I will post back when I get it and put it on.

Thanks again for all the help.

EDIT: Vixtor, the tension isnt the issue. There is a crunching noise after swapping the chain. The cog needs to be replaced. Was checking if the chainring needs to be replaced too (still wondering about that btw ).