To mikeinfargo and others with the "45º bend-at-the-bottom" problem: The primary reason for overscan is to hide defects at the outer limits of the raster, unlike with computer monitors, which display everything you send to them. My 36XS955 doesn't have your problem, but other garbage and nonlinearities are present in that area, and at the left and right, too. So the overscan hides it, no problem. If you are pushing for distortion-free zero-percent overscan, IMHO you are asking for aomething the set was not designed to deliver.
That said, I wonder what causes that particular distortion. It is as if the timing of some internal sync pulse is a bit off. If it were my set, I can think of a few parameters I might tweak a bit to see what happens, being careful to backtrack if matters get worse or the picture disappears or goes bonkers.
You might possible experiment with 2170P-2: CLPP~SNYP (#7-11).
Also in MID1: #1-DVPH, #9-MDVP.
In MID2: #2-DRVP.
In MID3: #2-VDVE, and any of #4-11: VDVO~VFRV.
A quick look at the deflection parameters in 2170D doesn't give me any clues.
Keep your eye on that "bending" region on-screen, and click a parameter's value up or down just one notch to see if anything improves. If nothing changes, click back immediately to the old settings. Same if the picture screws up terribly. If you want to revert to your last-saved settings, press 8 (screen > "READ") then Enter.
The usual cautions apply. Write down a log of what you are doing, especially the old settings. Don't click any three-button combinations or you might Reset the TV accidentally, not good! Go slowly. If you have pressed a button that puts "INI" or "RESET" onto the screen, STOP and wait for it to clear. If you discover something useful, post about it here.
Don't try to access any channels with the number buttons -- they don't work that way in service mode. You have to use the two up/down channel buttons.
Read Post #3 in this thread for navigation particulars.
And, please, please, don't start or persist in any personal insult-wars here, or NO ONE will help you.
"We all get smart slowly."