No scientific measurements, just a quick audio test, comparing HeadSpace to Digital Delay 1/16ths, in Parallel:

Sounds like the way to go is set HeadSpace to Tempo Mode, the Delay Time to 1/2, and Head 1 Div to exactly 1/8 (no + or – %).

A Head Div of “Min” seems to be a whole lot less at a Delay Time of Whole @ 120 BPM.   Min+50%, now that’s more like it [1/16].