Thanks to this thread it got me thinking again about contrast settings: I found a test pattern with a grey ramp and checked on my TV and my projector (both contected via my Edge VP). I found that I could set the TV's contrast to a sweet spot where the ramp was smoothest (though not perfect) but I also knocked the Edge contrast to -1 as recommended on here.
I checked on my projector, where the ramp was already much smoother (possibly due to the VideoEQ outputing in 10 bit depth after applying the LUT?). Again a small amount of tweaking found a sweet spot too with virtually no visible bands when viewed from my seat. I have two similar settings saved with the only difference being the gamma changed from 2.2 to 2.3 and found that these also needed slightly different contrast settings to get the smoothest ramps.
I never would have considered this adjustment had I not seen this thread, so again it shows that after 2+ years of calibration I'm still learning.
I'd previously accepted that the ramps didn't look smooth due to the limitations of the display. I guess it's more placebo now, but watching a HD recording of I am Legend tonight looked really great and not a trace of any banding even when I went back onto some live SD broadcast afterwards.
I'll have to order the S&M disc to check a few other items, then I guess I'm going to have to re-rent the i1Pro again to check if I've messed up my calibration with these changes (and re-check the ramps again during to make sure they stay optimised