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Well, that sound coming from the HV cage could be causing your problems. Maybe not a failing flyback, but rotting wires, etc could be discharging some of the HV before it gets to the picture tube. My CTC-9 had lousy HV until I listened in and heard a hiss like yours. I switched the lights off, and I could see the tube cap was glowing purple, like with a heavy static discharge. Looking closely at that cap, I saw it was cracked, and bleeding HV.
Of course, most of your HV stuff is UNDER the chassis, so you'll probably have to pull the whole mess out, and run the tv on its side on your workbench to get a visual on that hissing sound's source....
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