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The neon HV test method is going to be inaccurate on an RF HV supply like this, if your use to doing it on Flyback based electromagnetic sweep sets. The neon operates off RF. On a flyback that RF is a low power harmonic, but on a RF HV generator that RF is the fundamental sinusoid....
If you have a resistance based HV probe with a meter (something we all should have IMO) use that to check the HV. Your HV is probably close to the right value and your letting a crude indirect servicing aid confuse you.
The deflection shrinkage issue is probably a low B++ line issue as others have noted.
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