Just starting down the Sultan road myself. This is my little talkative roo Igor. Will be doing a mixed white silkie and sultan run. Hoping to get that sultan puff on some white silkie crosses And could use any and all info on these guys
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You are going to love them.
It shouldn't take long to get the poof on silkies from the sultans. The issue I see is vulture hocks, I think silkies are not supposed to have them. But if it's for your own enjoyment, then ENJOY

I started outcrossing sultans to cochins, standard cochins. I wanted bigger sultans and colors. First generation has little poof and large combs, over 50%+ are culled (sold) due to not having 5 toes, beards and muffs. Bred back to sultans the ones that I called keepers, Produced nice chicks! Many while not showing a big vault like in avatar grow into huge poofs (and often 2 times the size of my standard sultan original stock). 3rd gen bred back to sultan are amazing, and I'm having a very hard time "culling" any. Next step I'm going to work on wing drop. I lost that in my crossing.
You shouldn't have to "cull" as heavily on your first generation because silkies have 5 toes and sometimes muffs and beards. You will have some work to get back to the silkie comb. I read a bit of the genetics on that, but have totally forgot it haha. Interesting project though.
I've tried all the feather foot breeds and nothing tickles my fancy like Sultans. I love them, really love them.