I have also used Microdol-x and metaborate as a two bath and made very compensated negs as Microdol-x is a second cousin to D-23 as near as I can see. In my mind it is a very good solution to reciprocity failure problems. I would recommend that at the time of shooting that one consider this development option and give plenty of exposure to the neg or roll in question. That will support the shadows values.
lee\c