I have not heard of using more than one olivette per rig, if I use an olivette I use the biggest i can, then add dropped shot further down to fine tune. Spread bulk is more for fishing on the drop, how large a float are you using?
A single olivette replaces a bulk of shot so one olivette on the rig would be fine but as Benji says you dont use more than one olivette as a rule.
Also its worth keeping in mind that not every rig/float requires an olivette some can have just spread out shots or style leads depending on how you are fishing and how the fish are feeding.
hi, i am using shot as well, but i was being lazy, i bought a selection of olivetties, and are using them instead of shot, ill remake my rigs, with an olivettie and a few shot spread down the line.. thanks.