Firstly, check if your beacons are transmitting any data at all. This can be down by logging into our Beaconstac Android or iOS apps and going to My Beacons and checking for the RSSI value (measured in dBm). If they are not being detected check out this topic.
If your beacons are being detected then here's what you can do:
Check what works best for you. For assistance on how to change the Tx power and the Advertising interval follow this link.