First, put in a hot plug like an A3 to see if it will burn the fuel more efficiently. The OS 8 is too cold.

Second, readjust your low speed until it idles for longer than 30 seconds and will take a reasonably advanced throttle without stumbling or wheezing. Then, peak your highspeed needle.

I bet there is a good chance that your engine always sounds cold when cranking and first advancing the throttle. This is a common characteristic of Evolution glow engines with OS 8 plugs.