Hey again. (didnt mean to offend)
I have worked on 767s with CF6 PMC/FADEC Rolls/R and PW. All only load shed the systems you list when the aircraft is in single electrical supply config...There is no reason to shed so many systems to power 2 extra CAT (Center Aux Tank)boost pumps when you have 2 servicable 90 KVA IDGs powering the aircraft.
Maybe this is a software conflict I will have to check next time I fit another operators BPCU
Perhaps the the wiring/config you speak of is in the latest of the 767
You could try the web site
www.myboeingfleet.com
I could only retrieve info on my companies A/C