Rex, to check the possibility of using the PIE program to set the AF Micro Adjust, I made a test of my A77/100mm Macro at f2.8 on a tripod with SSS off and 10 sec delay. I took shots with AF micro Adj set at 0, -3, -6, -12 -20 and +3, +6, +12, and +20. I used my 45o test sheet with the lens focused at about 1:2.5 magnification. At 0 Micro Adj, PIE indicated AF Status Active Sensor: Back Focus (+593)
AF micro Adj at -6 was the best (I think) although there was not a big difference from -0 to -12. The -6 gave me about 1/3rd front focus, 2/3rds back focus which is my preference. However I have come to the conclusion that for my camera/lens combination at least, AF Micro Adjust is a storm in a teacup and is not as useful as some would make out. It may be helpful to those with a camera and lens combination that is way out of specifications. The PIE program may be a help there also.
Have you come to any conclusions yet?