I love my Dominican Salon, I dont think there is a specific "secret" because I had the same result when I went to my old hairdresser (black). What I did notice is the DS I went to years ago did the regular wash, condition, set, blowdry, and bumped with curling iron (Im not sure what products they used I was young). The salon I go to in the Bronx is my favorite sometimes I bring my own products but I dont mind if they use theirs, their products are mostly from Spain and Italy. They wash, condition under the steamer, roller set using silicon mix leave in, and dry under the pibbs, the end step depends on the client I get my roots blown out and my hair wrapped. My hair always feels wonderful.
I dont allow them to use oil sheen spray, I noticed she used a product called La Una (Italian)
Just a sidenote, all Dominican Salons aren't the same, the salon camio appear at in Philly does the regular wash and set, but I always bring my own products, after the curlers are out, they blow dry the hair,(but not like in NY, where they blow dry and achieve the style), then Flat iron with a 2 inch Flat Iron, then Flat iron again with a small flat iron to curl the hair, after this they do pin curls, and spray (holding spray and oil sheen
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sorry my post is so long i just got excited when I saw it was something I can reply to