On Ku band, a 1.0 meter offset dish should be fine. The problem is that the feed on 83W is pretty darn weak, I think deliberately. A 6 footer with a Ku lnb should work, but probably won't be as strong as a 1.2M offset , because of the geometry mismatch of using a Ku lnb with a prime focus dish. Do you have a 90cm Ku dish you can try? You might be in range with that from your location, you are in the strongest beam, and I can barely get it on my 90 cm in a weaker beam area.