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Nice save!
I was going to suggest looking inside the HV cage in darkness also.
If the HV is lower after replacing the parts you might have solved that breakdown/corona problem. If you use several cleaners in sequence you should end with alcohol, that will remove any left over moisture.
BTW, this is why only replacing the old tubes that test bad should be replaced. You could cook a brand new tube if there is a circuit fault.
You are making a big step going from radios to a color TV. This could be a long road. Do you have a color pattern generator? You may need one to adjust the convergence and color balance.
Fixing the HV first is a good call (assuming the main supply voltages are good), the regulation of the HV is important to get the image correct. In a B/W set small changes in the anode voltage don't effect the picture noticeably, but it does in a color set.
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