I've never had an issue with my car idling poorly, but it's raining today and I figured I would mess around with it a bit and see if I could get a little more vacuum.

Quick specs: ls6, ls2 IM/tb, ysi, arun's stage 3 cam, e85

First thing I did was played around with the timing, I went as low as 19 degrees and as high as 28 degrees and it did not make much of a difference at all, 19 was a little too low but 21-26 lets say was exactly the same. So with this knowledge, what's the money spot to set it at so that the adaptive spark can still do it's thing?

Second thing I played around with is the idle RPM. A stock C5Z idles at 800 rpm. If I remember correctly (it's been a couple years) Greg Banish recommends adding ~50 rpm in Calibrated Success if you have a supercharger or a cam. However with my testing, I was able to pull the most vacuum at 900 rpm. So my question is should I leave it at 900 rpm? Are there pros/cons to that high of an RPM at idle?

*For those of you that don't know, the stage 3 cam specs are 230/242 .609/.615 115+3