Well, the idle adjustment (quite obviously) has just masked one of the symptoms of a greater problem. Don't know why you'd feel it was the problem as (I assume) you didn't touch it prior to now.
Time to start with the usual things. First, reset whichever screw you adjusted as per the TSRM... if it's not shown in the TSRM (which is because not even Toyota certified techs are supposed to dick with it) then set it back how you found it; where it was back when everything was running fine.
Then, physically inspect the ISCV, just because the stepper motor is trying to move doesn't mean there isn't debris in there keeping it open. Check the cam and crank timing and make sure the timing belt tension is equal on both sides... See the FAQ for a LOT of info on adjusting and setting both mechanical and electronic timing, I'm not going to recap all of it.
Have you inspected all of the intake and PCV piping for cracks? Have you verified all of the vacuum hoses are correct? I don't suppose you marked the CPS before you pulled it so you could at least reinstall it where it was previously (should put it at 10?)?
This sounds most like an air problem; One tooth on the CPS will cause a minor bog but won't cause the idle jump a mile. You didn't try to clean the KVAFM (that's the air flow meter), did you?
When after having the head tested and reinstalling the cams did you verify the cam/shim clearances? This would cause bogging but not a high idle.
When you reinstalled the cam gears did you use the center holes on both cam and gear for the dowel pins?
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