I packed them with lead pellets, using a hex/allen screw driver bit on each side, packed to the max to 7.3gr each, still not variating all the way with the stock spring, but it helped alot, still tops out at 35-40 but it gets there quick. This is kitted (no case work yet), carb, and pipe.
Look in the malossi catalogue that came with your variator, the malossi colorrolls are light ass rollers for racing, blue ones are only 2.1gr. They also make the HTRolls like we get with the kit up to 14gr, all are black.
I think you are talking about the the polini comes with yellow 7gr and blue 12gr weights, questlove's bike is more tuned out than mine and he is running the blues with stock spring. This leads me to believe that we need somewhere in the 10+gr range, especially if we want to run the reinforced spring.
Here is my post on it: