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Issues you're having were very common after some tubes got rejuvenated. I always imagined little pieces of "crud" that got blasted off the cathode during the process were floating around in the neck and sometimes settled between the gun elements resulting in the arcing and flashing. After awhile things will settle down. As far as the bright picture, if it continues to act up try shorting pin 5 of the CRT socket to ground. There is a 100K resistor (R14), and a cap (C2) in parallel to ground from pin 5, just solder a jumper across the cap. This will darken the picture slightly, but you can turn the screen up to compensate for it. This will keep the picture from going bright when a piece of crud lands between the screen and grid elements of the gun.
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