Early 2013 MacBook Pro UE Boom Bluetooth Issues
I've had some success by installing XCode, then installing the associated hardware IO tools, which include the bluetooth explorer.  The bluetooth explorer makes available tools..audio options, which lets you tune some settings.

The settings I found useful were to increase the bitpool (which appears directly related to audio quality), and to increase the buffer packets, which appears to make it more tolerant of temporary dropouts.  YMMV.