I was in similar position as you, SB-1 visa was denied too. Their decision was based on that I could travel to the US once a year so denied my visa - If I travelled once a year I wouldn't need to apply for SB-1 visa..... Anyway I took a chance and got on the plane few days later and went through custom without an issue. Obviously it was a nerve wrecking journey thinking of all the plans with a big folder detailing why I couldn't return sooner, when I got to the port of entry. They looked at my documents and finger printed me and let me through - didn't ask any questions or looked at my folder - I had to double check if I was actually free in the US when I went outside to inspect the surroundings and saw taxis, I was free! This will depends on the Custom officer I guess. Wish you all the best on what you do next.