NOTW-I have a couple HVLP systems....Earlex 5500 and Fiji mini mite 4.  Both require some thinning, despite the fact I have 2.0 nozzles for each.  In order to get the paint to atomize, I think it has to be reasonably thin.  That said the little dribble cup, says it is perfect at 8 seconds, but I have sprayed with the drizzle time to be 50 seconds and it leveled out and looked awesome.  It also say not to thin more than 10% and I have gone up to 35%.  Now the sheen is somewhat effected in that it get more and more satin the more you thin.....but still looked awesome.  To be awesome, I was shocked at how nice it looked.

Mike