I'm no expert on these little ones. So I'm going to tag a breeder of Silkies that may help with your ratio.
@2ndTink can you chime in?
I can say I've heard of roo to hen ratios in the smaller breeds is lower. But if you trust your breeder and have the space and coops to separate multiple pairings I think your good especially if you have a bachelor pen available.
I'm breeding Marans so large fowl. I'm fortunate enough my main roosters doesn't allow matings in his presence but by 12-14 weeks I need to separate the feisty ones to a bachelor coop and run and block line of sight to reduce fighting. I don't tolerate any overmating or tag teaming of my girls.