you're unlikely to go all the way down to idle revs on a gear change (just removing load), I'd be more inclined given the age of the bike to check out the rear loom (chaffing problem) or an electrical connection somewhere.
run the bike up without the panels on and give the wiring a go shake around, see if you can locate the problem that way?
Of course it could be carberation, fuelling, coils, leads, plug caps or plugs, but if otherwise the bike is running normally , that would be my starting point.
Cheers Mark.
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Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a Ride!
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