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@pip
Theres no trick, AFAIK, to Sugino 75 BBs. They work just like any other loose ball adjustable BB.
I assume you're using a pin spanner and right tools, have the bearings facing the right way (assuming this is a new 75 BB with the caged bearings) and know what yer doing, so my only thought is maybe you're using too much grease and getting false positives when trying to get the adjustment right.
Aside from that, I'd inspect the bearings and races for damage; try with loose ball bearings as maybe the retainers are damaged in some way?!?
I know how frustrating it can be when stuff just doesn't work.