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Can you post a pic of the total CRT back magnetics? Does this set have the little hairpin-shaped purity poles on a tube mounting ring (around the CRT bell) like the CTC-7 mount I put in my -5 to accomodate the 21FJP22? Those hairpins do make a difference in uniformity of the purity.
If this chassis has the multiple magnets around the edge of the face, I'd suggest removing them when using a glass tube. They were necessary for the metal-bell tube, which strongly distorts the fields very near the edge, but their effect is probably too strong right at the edge of the glass tube and falls off too rapidly towards the center.
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