I built up my Pacenti Brevit 28h rims onto these 7700 hubs the other night and was able to compare using 2x in front with 3x in back.
The 3x looks far better to me in terms of minimizing any cyclic changes in spoke tension due to drive torque on the rear hub.
FWIW, I was able to
just get to 100kg driveside tension before any further tension increase tended to force the rear rim well out of true.
These are vintage-style rims that nevertheless "hit the numbers" in terms of credibly vintage profile, prodigious width and light weight.
As such, they are not going to build into as high-performing a structure as a rim with a modern profile, especially on an 8s, 130mm rear hub.
Very nice rims though, just what people have been asking for! Build weight was 1753g using 14/15G spokes and brass nipples.