Thanks so much for your suggestions.
You got it pretty much right; the room is small and square. About 3.2m * 3.2m. Bulb already in low light mode as screen is only 92" (big for a small room though :-D). There's not a lot of ideal in my setup...
Screen about...let's say 5-10cm (2-4 inches) from the meter. I did the calibration using Curt Palme's guide (http://www.curtpalme.com/forum/viewtopic.php?t=10457
)...meter was adjusted for max light output, though I didn't move it up or down as this wasn't really possible the way I set it up. Still, was getting plenty of light output and adjusted it for the max I could get moving it left and right, closer and further from the screen (meter was about 1/3 of the way up the window in the middle of the screen on the Rec709 disc available on these forums).
I've been wondering if my service mode adjustments are different to other people's? I'm in Australia, it's possible they adjust them differently here. You mention you found out that there can be different white balance presets in service mode? I am already using User mode 3 with the color adjusted to flatten out on 6500k with the correct amounts of R/G/B. I had to add a LOT of red to the gain (that's the one on top, not bias, right? It's at about 26 out of a possible 30) to get it like that, is that normal? I read somewhere that projection bulbs are often red deficient, but most settings I've seen didn't need that much added...still, room setups influence these things a lot I imagine...
I will try it again with the iris switched off though. I left it on as I read somewhere it changes calibration a bit between switching it on and off, but that keeping it at a constant value shouldn't affect things...?