Josh,
dyp...What PS RIP do you use?
Colorgate and Fiery XF.
Fiery Color Profiler has more controls and seems to create better profiles. XF has to many bugs so I have been using ColorGate the most of late. I am getting some pretty good profiles out of Colorgate as well. If I don't do in RIP linearization and create just the profiles with FCP on top of the L360 calibration I can use those FCP profiles in ColorGate. Not sure you want to use the L360 calibration with backlit SAV though. The techs will tell you that shouldn't be available and not to use it. If I understand it correctly it is not available for backlit on the L560.
Anyway if you start to punch up the ink density and don't use linearization and back the ink limits down in the RIP to where they should be you are going to have problems. Why the Cyan density is so high on the L360 compared to the other colors has been a real puzzle to me. That I believe is one of the problems of why it is so difficult to achieve good reds (especially the brighter ones). Anyway if you know what your doing with linearization and per channel ink limits and the best media preset ink density for your selected media, that is just enough so the that the RIP backs the ink down a little especially the Magenta and maybe the Yellow you can get some awesome reds. Don't be alarmed at how far the cyan gets backed down. Just let it do its thing. This is the same way we had to deal with the 250 and 260 models, but you just can't control everything with the L360, but I try to control as much of it as I can at least for the color critical job where the highest gamut is desirable.
O yea I wouldn't go below 12pass for this kind of output anyhow which you can't if you go to a higher than 120% density. jfiscus is correct about the 16 pass setting. You can also use 12 pass and slow it down with the Inter pass delay setting, which you would probably want to do anyway if you have heavy coverage with lc or lm ink because of possible ink starvation form one have one lc/lm printhead.