Okay, disregard the air baffle question. After dismantling, I found that I'm not getting proper defrosting...quite the ice damn built up, blocking all airflow to the fridge. Nyah ha! So, now I have to figure out why she's not defrosting.
Using the wisdom of this board, eight years ago I did the copper-wire extension from the defrost element down into the drain tube, which kept me drip and trouble-free until just recently. I notice that my copper wire is pretty tarnished; might it be simply that I'm not getting good contact and I just need to replace that wire with a nice new shiny one?
Since I've got the works out of the box anyway, should a local parts place be able to do a quick bench test on the defrost timer and thermostat, and maybe the main fridge thermostat too, and tell me which if any are kaput?