Printer Driver Problem? Page margins shift when using paper tray vs. manual feed

Question

I am printing to an Apple LaserWriter 12/640 PS. The printed page and page margins are PERFECT (WYSIWYG; "What you see is what you get") when printing either to: (a) the MANUAL FEED TRAY of the Apple LaserWriter 12/640 PS; or (b) PDF to view on screen.
HOWEVER, when printing to the LaserWriter using the (ordinary/usual) paper cassette (you know, the thing that holds the 200+ sheeets of blank paper), two margin problems occur: (1) the uppermost portion of page content is shifted down 3/4" (maybe closer to 11/16") vs. its position on the manually fed paper.  This, in turn, causes the botttom portion of the page content to run off below the printed page.  (2) The "unprintable region" on the right edge of the paper expands from 1/8" with the manually fed paper to 7/16" when using the paper cassette.  This shows up as an extra 5/16" (7/16" - 1/8" = 5/16") of white space/missing page content on the right edge.
The problem is consistent and reproduceable.  It happens with cassette fed output from Safari, Word 2011, Acrobat X, TurboTax, Quicken Essentials for Mac, and TextEdit.
BIG problem when printing long documents whose content and margin settings I cannot control (e.g., third-party documents from Acrobat, anything from Quicken Essentials or TurboTax, pages from Safari, etc.).  The only workaround is to feed everything manually (UGGH!).
I suspect the printer driver is faulty since the problem detailed above happens with so many applications.  Is there a way to edit a plist (using the application/utility "Pref Setter" or similar) to overide the driver's margin settings?
I believe the print driver is "Apple LaserWriter 12/640 PS v2015.105" (from Sytem Prefences->Print&Scan->Options and Supplies->Driver).
Any help greatly appreceated.

Answer 1

Thanks!  It works perfectly!  I even saved my original "oversize" document by printing it to PDF with the scaling so the problem is permanently cured, at least for this document.