I am using PM5 and the new i1Profiler and as for BA targets I don't know if there is any magic involved.
I just know that I can build ICC profiles with the biggest gamut and deeper black than with any other targets including the new i1Profiler ones.
Since you've got an iSisXL and i1Profiler, do yourself a favor and build a profiling chart using 2,976 patches....this will fit neatly on a single 13"x19" page with 6x6mm patches. If you want to go nuts, use 5,952 patches for a perfect fit on (2) 13x19" pages. If you're doing CMYK profiles, try setting the dark/light patch weighting to -25. Set profile Tables to "Optimize Quality".
If you don't get a Dmax/minL* equal to or better than Bill's charts, I'll eat my iSis.
Terry