I got it! Really proud! 15 ramps. The extra bit is also there, make sure that that one is stated to the left in your beginning position. And also used 3 crossovers.
I’m not sure if it works. The third crossover is not needed.
At first it was completely unclear how to solve this problem. Then I realized. The solver found 16 solutions to this problem. Perhaps not all of them are original. Here is one of the solutions.