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pot and L14 sound good.
I suggest since it seems hyper sensitive to blooming you try the following.
start with just the raster, setup for the good 25kv from low to full brightness.
connect a meter to the crt red cathode lead (yellow/red) note voltage and adj crt bias, see what happens It should smoothly decrease in voltage as you turn clockwise.
do the same for the other cathode leads yellow blue and then yellow green, but not only test the bias pot but the two drive pots as well on those colors (green and blue, there is no red drive pot).
see if all the controls result in smooth gradual voltage changes.
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