Hi,
Your charging voltages sound OK to me.
I wonder if the extra current being drawn when the head lights are on is too much for the main fuse holder, main wiring connectors or contacts in the ignition switch. If so the problem would get worse over time as they get hotter and drop more voltage, possibly causing the symptoms you describe.
I would suggest feeling for any of these areas getting hot when the problem starts to appear. Also try before problem appears but after bike has run a while so that you know how warm is normal.
If this is the problem you could use a relay to feed the headlights straight from the battery (with in line fuse as near to battery as possible), so removing quite a bit of current from the main wiring, fuse & ignition switch. And an added bonus of brighter head lights.
As for blowing headlight bulbs, it might be worth checking the charging voltage over the whole engine rev range. If it goes over 14.5V a charging problem could be the cause.
Good luck
Mark
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