You have a couple of options. You can download a map of Power Commander's website, but you already know those are extremely basic maps, (sticky) "PC map postings" or unplug the PC (so it runs better) and just wait til you have the funds for a dyno run. I'm sure your tuner already told you... you should always allow for your bike to get up to running temperature.
If you are only running your PC III usb and no other units i.e. Ign mod or multi hub, then don't worry about updating the firmware.
Question for ya? How do you know its running lean?
"If your actions inspire others to dream more,learn more,do more and become more, you are a leader". John Quincy Adams