I GOT IT!!!
It took a while, but I finally got the Superuser off of the phone! Rerooting now!
I got into ADB and finally didn't get rejected for file permissions. Then did the usual
su
mount -o rw,remount /dev/block/system /system
rm /system/app/Superuser.apk
rm /system/xbin/su
rm /system/bin/su
In case anybody else has this problem, what I did was cut and paste the unroot script after the remount command in the root script and ran that. This finally cleared the botched root files, and I was able to re-root properly.