How have the connections been for you generally, on both systems? I'm starting to wonder if it might be on my end as to why I get so many 1 & 2 bar battles. It's a LITTLE bit better on 360 side, but it's not saying much.
Longshot, but could it be that someone else has the same or similar GT as you? I remember when I finally got my PS3, I tried to use the same GT as my 360 but the powers that be at Sony essentially said "don't even think about it." Hence why I put the "01" at the end on the PS3 side.