often times you can manually adjust the screen size with the monitor controls
Unless I'm missing something here, LCD screens don't have geometry controls

I'll bet the floppy issue is a hardware problem -- the heads on the various floppy drives you're using are aligned differently. I've had better luck using a usb memory stick (currently a Lexar JumpDrive).
I've considered using a pen drive, but I doubt the problem with the floppies is hardware based. I've tried the floppy on over a dozen computers and it ONLY works on the hardware models that are identical to my work computer. Also, keep in mind that on the machines were Knoppix won't load the floppy, it can read it and the files on it fine after it boots.