To me it does not look like any pit marks. If it's got the pit marks I am talking about you can actually feel them, plus if you have almost a gallon on it with the stock shims and 30% it would be very marked up after that much fuel if you did need the shim. The engine should be loosening up for ya right about now and you should start to notice it runs better and better every week.

Also, I see in your pic that you don't have fuel tubing over your exhaust springs. Cut some fuel tubing and put it over the springs holding the header to the engine and you will never loose a spring from rattling off.