Mike,
The first thing I would try changing is lytic C2-B on the cathode of the verticle output tube. It has been my experience that this is usually the culprit for most of my verticle shrink problems... especially in color sets. Just for shits & grins, change C62 and C63 as well. While working in this area, check those resistors you mentioned to verify they are within tolerence.
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if you look there is a little paper wrapped electrolytic 50uf, comming off the same cathode to ground, I got my eyes on that cap.
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Note: According to the number you gave me the other day, your TV has chassis 528.38503. The diagram shows C2-B as being 50 mfd. But... notice on page 14 in the capacitor parts list... there is a note by C2-B. It says that your chassis should use 100 mfd instead of 50 mfd. Just wanted to make sure you caught that. When you follow the circuit in your set, double check this to make sure.
IMO, you should just go ahead and change as many of those caps in your set as you can get. It looks like your set uses those paper-wax and plastic tubular caps for couplers, and those are always prone to failure after 50 years. Same goes for your electrolytics. You'll find that in most cases this will pretty much correct almost all of your set's quirks, and also it will save you time in the long-run. I'm sure that most everyone here will agree with that.