Dont know exactly what you mean by a low dose on a Rocky, cos the dose depends more on the machine than the grinder. As far as basket/grinder is concerned, it doesnt make a difference.
A lot of people on this forum seem to have the Synesso basket/Silvia combo. MAybe they can shed more light on this.
Synesso baskets are good if youre getting a fitted tamper from Pullman, cos they can just make it on the spot rather than sending your baskets in. They apparently seem to hold their shape better and be more consistent in size. And knock out easy with no ridges.
I use the Synesso double/Pullman combo at home on my Minore and its the goods. I also used it with a Rocky grinder at one stage, but that is being borrowed.