Your idle should be smooth, but low. A high idle usually only leads to higher temps. When i refer to tuning a clutch, there are certain things you can do to make the clutch engage later, or earlier. For instance! If you need to raise your idle for some reason, but your clutch kept grabbing, you could use heavier springs, or shave the clutches for a later response. My goal for idle is to get it as low as possible, without stalling while running, braking, or just sitting. There are other benefits to tuning a clutch. A later engagement would mean a harder out of the hole punch. Simply because your motor was at a higher RPM when the clutch engaged. I prefer an early clutch engagement, it keeps things really smooth. I also always use aluminum clutch shoes. I like the way they grab.

Matt