Last tuesday I've managed to print some parts for the Prusa Air, but this kind of empirical tuning of Violeta it's giving me something to think about. There's a science behind this stuff, this shouldn't be all about empirical experiments, so I've googled around and found many theories how you should calibrate your 3d printer and/or setup your skeinforge configurations.
Skeinforge it's uglier than hell, but it's the most used slicing tool, there's a bazillion of knobs and values you can change, but apparently, if you suffer from a light OCD, you can get some decent prints by changing just 5 settings :)
At least this is the approach you can find in ProfileMaker.
Josef Prusa made a RepRap Calculator, a valuable tool for sure.
I can't wait to start making some printers. :)