BQ51050B: How to improve range on designs using the BQ51050b

Part Number: BQ51050B

I've been using the BQ51050b RX in a design for several months now, and I'm just not getting the range that I need. To get any boards to work, I have had to take apart our transmitter so that the RX coil is actually touching the TX coil in order to get power transfer to begin, and a fraction of the boards fabricated never even get above the UVLO to start charging. I know WPC 1.1 only supports up to 7 mm, but we're not even getting close to that. If I need more range, should I move toward the WPC 1.2 technology?