I'm on a ZX6R not sure what you are on.
I have run -1 +2 at T-Bolt, this SUCKS don't even bother
I have run -1 +1, this was better but I was still a little in between especially coming on to the front straight, 4th would have me winding out coming onto the front straight and 5th would just not give me enough drive.
I am now running -1 front OEM size rear (43)
This seems perfect for me in that I get great drive under the bridge in 4th. I find that now I'm using 2-5th occasionally if I get really good drive under the bridge I may have to just click 6th before my brake marker but not always.