rca focus problems

[drh4683]

Ive got two rcas with focus problems. One is a ctc31 from 67 and the other is a ctc38 from 1969. My problem here is that the focus just doesnt get sharp enough. Its not way off or too blurry but it can be better. For example, small lettering like on car commercials is barely legible because of poor focus. These chassis used the coil as opposed to zeniths potentiometers for focus adjustment. The focus circuits are pretty simple, what exactly goes wrong on the rca? Ive seen some other rcas in the past like this. Simple tube change of the 1v2 or 2av2 doesnt do it, niether will hv tube changing and hv voltage adjustment. Just as a note, The picture DOES NOT bloom when the brightness is advanced which is a good sign. Im wondering if there is some resistor or something that is known to go off value in these circuits that you guys might know of right off the bat. Id rather go this way than to tear into the chassis trying to find the problem.
Id like to mention, that in my ctc31, the flyback does get warm, sometimes it feels hot, but the set still works. Whats the story on hot flybacks? Junk?
Thanks-Doug