At the moment, the only way to get L+R total power from your Powertap P1 pedals is to pair via ANT+. When paired via ANT+, we capture power readings from both the left and right pedals, but when paired via Bluetooth, we can only take the left pedal power and double it.
We hope to improve on this in the future by supporting L+R power via Bluetooth, however, I do not have an ETA at this time.