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Okay, managed to wire it back together despite a counting error on my part in disassembly.  It didn't look right and so I'm glad I double-checked, elsewise, there may have been an opportunity for venting of the magic smoke.

But I'm pleased to report that all the magic smoke is still contained within and it powered up as one would expect.  Of course, before I was consistently able to receive the local station during the daytime, and I could hear multiple stations at night.  It is still receiving, though poorly, and due to it being night, I can tell that there are several stations it's trying to tune in.  I suspect the fix(es) made to the transformer may have made an alignment more necessary as now, I hear much more the "heterodyning" noise as I've heard it described, and it seems to be overlapping with the stations, instead of "surrounding" them.  The stations are relatively quiet where I can get the heterodyning sound to be gone.

But, as I said, I think that may be able to be addressed with an alignment.  The fact is, the stations are there, and I now get a solid, reasonably stable 249V - 250V at the IF 6K7 plate.

So here's a theory: that this transformer may have been bad for a while - even since the last time the radio was aligned, since correcting the 2nd IF transformer solder joints (necessary to fix the voltage on the 6K7) knocks the radio somewhat out of alignment.  Make sense or should I save the theorizing until I've learned the craft some more?

As I said, the radio played before, but I have no knowledge of what the voltages looked like before I started messing with it, so perhaps it was calibrated to work "properly" in that sub-optimal state?

In any case, I wash my hands of it for tonight.  The next day I work on it, I will take a final set of readings of voltages, just to get a sense for the whole picture and then potentially try to align it, which I hope brings back at least the level of quality that I had before.  With any luck, maybe it will be better.

I did find a discrepancy between the wiring in the radio and the schematics, though, which I will run by you, simply because I don't believe this is a mistake in my work since the beginning:
As presently wired, and like I said, I believe since before I started working on this radio, pin 5 on the IF 6K7 (suppressor grid) is not connected as drawn on the schematics to Resistor 55, and by extension to the bias resistor, but instead to pin 1 on the 6A8 (shield) and also to ground.  That 6A8, pin 1 connection appears to be the path to ground for the 6A8 heater as well.  Now, I did unsolder the wire coming from the 6A8, pin 1 in the process of removing the tuning sub-chassis, and I could potentially have been accused of mistakenly connecting it to the wrong pin on the 6K7 when putting it back together, but I don't believe I would have made such an egregious error as to have soldered it back to a tube instead of to either the terminal strip or a grounding tab.  I certainly wouldn't have removed and reattached the wire from the ground tab to pin 5 on the 6K7 that didn't need removing, hence why I'm pretty sure this hasn't moved.  Maybe it's a change?  Maybe it's an incorrect schematic?  Whatever the reason, it definitely didn't happen tonight.

In any case, the radio is still in as playable a state as it has been (excepting alignment), and not sure what this kind of discrepancy would yield as compared to being wired as shown in the schematic.  Thoughts?  Should I attempt to rewire this connection?

Thank you very much, MrFixr55, for keeping me looking in the correct direction for troubleshooting the voltages.  I wish I hadn't had to get into the transformer, but I'm glad doing so yielded this much result, at least.

Best wishes,
Roy