I ran 1.0mm springs on carbon shoes and was quite pleased with the overall clutch engagement and performance. That setup is usually a good starting point. I recently upgraded to a Werks Clutch which is a night and day difference - but unfortunately was a night and day difference to my wallet also.

Alex - how much do you usually get out of your carbon shoes before you have to replace them with that setup? I remember reading about a setup like that (I think it was Kortz') and he said that he only got about a main or a couple qualifiers of his carbon shoes with that aluminum shoe on their because it chewed up the carbon shoes so badly. I know your running Mugen whites and those seem to be a bit harder, but i was also wondering if you tried it with the carbon shoes or if your going through white shoes often as well.