Dumb question, but did you try adjusting the vertical hold adjustment in the front? The image will sit up a little higher than an NTSC image, but it'll still be plenty viewable.
If the v.hold doesn't do the trick, your model may or may not have a tiny/chinsey (easily breakable) v.sync pot inside the case, which takes an alan wrench to adjust the lead based coil. If not, it's a regular trim pot that takes a very small slotted screwdriver. Either way, should straighten it out if the v.hold fails you.
@AmigaPixel:
The later 1084's were made in Korea, Malaysia and maybe even Mexico.
@mr_A500:
I opened up my beloved 1080 this morning and performed a couple of internal adjustments. I am now able to view both PAL & NTSC within a tolerance that's pretty darn close to each other (although not perfect). Still have to adjust the v.hold between switches, but the cropping is NOT as severe as before. Thanks for the info and giving me an excuse to get yet another Amiga project done!