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On start up, mine idles around 1000 rpm. After a minute or two the idle comes down to 800 rpm or so, After I start driving the idle is at 675 RPM. Confirmed by scan. I think your where you need to be.
I set my timing at 8*btdc w/ est disconnected, my tps is at .54, and my idle is at 650-675.
Is 650-675 too low?
Your idle speed is burned into your chip. Your nonadjustable TPS and advanced ignition timing won't change your idle speed unless they cause a condition outside of the range the IAC can compensate for.