I really hate to say this but at the risk of sounding like a WA, do you know anyone in your circle of friends that is a motorhead? Someone who knows the ropes can often spot something in ten minutes it would take you hours to find. I know experience is a good teacher but I'd hate to see you harm your engine with extended running on what seems to be an extremely rich mixture.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".