GNU Radio, One Step at a Time: [Discuss-gnuradio] Phase correction

I'm looking into updating some of my interferometer code to work with
newer hardware, like DBS_RX2, which will have unpredictable
phase offsets between LOs.

I played with the fractional interpolator a little while ago, to use for
phase-correcting one half of the interferometer. Is there a better
method to use?