Well, lookie here!!
PSA actually took my issue seriously and worked to fix the label in a timely manner. Not going to lie, I put a lot of effort into imploring them to do the right thing, but it went relatively smoothly and now the card has been 'corrected'...
1973schmidtrc615PSA8ST.jpg
Of course, the 'value' was hurt by this undertaking, because I assume if forced to decide, collectors would much rather own a card with a 'natural' 'PD' than an 'ST,' but now it is honestly graded (and looking much better in the new slab)...and pretty sweet otherwise, I do declare.
So the answer to my original question,
"Will PSA Correct This Mistake???" is a resounding,
"Yes, Ma'am!!!"