How do I make my BeaconOSX iBeacon signal detection more accurate?

Here's my setup: iMac with BeaconOSX iPhone with Proximitask I am successfully broadcasting a signal and am getting notifications as I come and go to my office. However, the reminders are getting triggered well outside of the building and sometimes rapidly & repeatedly triggering when I'm 5 rooms away just sitting in the conference room. BeaconOSX has 3 values I can adjust (other than the UUID): - major (5) - minor (5000) - measured pwr (currently set at -10) The initial value of measured pwr was -59, and that's when it was triggering things on my phone from outside the building. Increasing that value to -10 seems to have helped somewhat. Today's reminders went off just outside my section of the building, but I'd like it to me as accurate as when I step inside my office. I've read that beacons need to be calibrated, but with just BeaconOSX and Proximitask, I don't think I know how to do that. I also read that increasing measured pwr *increases* the signal strength, making distance estimation more accurate. Is reducing that value also a valid way of preventing the triggerings from happening outside my office? Is there software I can use for calibration?