I read the following thread on adjusting the EHA and wow did it make a difference!
http://www.peachparts.com/shopforum/showthread.php?t=104289&highlight=eha+2mm
Running the AC unit running MAX out here in FL will up the temp to the 100+C range. When the temp is above ~85C and the AC is on the car is really really sluggish. So I hit the AC button just before a light turns green and she's OK. Not going to get me killed trying to vacate a busy intersection. (a vast improvement)
I replaced the Water Temp Sensor ($26 at the dealer) and to no avail it still starts rough, but smooths out within seconds. (as usual)
I'm interested to know more about setting the duty cycle.