I only had one with the pearl gene and it died before laying eggs. I have none with pearl in them anymore. My original 7 consisted of 1 golden pearl hen, 1 red breasted cinnamon hen, 1 slate male, 1 silver male, 1 red breasted silver hen, 1 red breasted hen, and 1 red breasted male. The red breasted male was overly agressive and culled and the pearl died. My 2nd generation was heavily silver with many ivories and nearly all red breasted. I kept a pen of ivories and then of the non silver ones I kept a blue face cinnamon, double factor blue face, and pair of red breasted cinnamons. I tried to put the cinnamon red breast with the blue face hens but he's agressive to any other button but his cinnamon red breast hen. For that reason my 3rd generation has been yielding mostly red breasted cinnamon and red breasted ivory which I haven't set any of their eggs. I decided I dislike the silver buttons except for the odd red breasted ivory male which is interesting so I have some potential tuxedo buttons in the bator to hatch friday along with finally some fertile eggs from my blue face hens and a slate red breast male.
I've used various calcium supplements but found no improvement in eggs, more eggs, or any sooner laying. The only thing that has had the slightest impact on laying age for mine has been protein. Otherwise despite them being inside it seems more likely a day of nice weather will trigger laying than anything I do including light amounts and diet changes besides protein. I'm learning to just be patient. All of a sudden one day when they are ready to lay there will be a whole bunch of ruckus from the room with the buttons and then eggs will start appearing by the dozen in the next week.