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The set uses a very primitive, nonadjustable AGC. You could bump the IF gain up just a tad, by doing this:
Jump a 3.3 megohm resistor from B+ to the AGC bus (test pt. B). If no change is noted, work downward in value (like 2 meg, 1 meg, 470K etc until a gain increase is noted. (the 12BY7 grid also becomes a tad less negative, which will compensate for the contrast control's not going full on).
Too much gain will probably cause sync clipping. But there might be some usable gain-increase before clipping or sound buzz sets in.
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