Expect more questions than answers.
I'm no a plug reading maven But those pics scare me.
Are those from a plug chop or just removed after a ride? What plugs are those?
The insulators look eroded??
Just a wild guess; you have leaky float valves, (very rich idle) and seriously lean mains?
We hear and see plenty of guys who's bike ran "fine" right until the RH piston holed...........
By 79 stock jetting was pretty lean out the door, make any changes (intakes, exhaust) and you could be in trouble.
But it's so hard to do any long distance tuning. "baffled pipes" those could be more or less efficient than the stock mufflers.....Foam filters, hard to get an engine to make even stock power with non existent airboxes. I guess out of general caution I'd be bumping the mains and see what happens. do float bubble tests, are the float valves new? Have you set and checked float levels?