One simple way to get incrementing parameters is:
Let (x_1, x_2, ..., x_n) be all between 0 and 1.
Define y_i = product(x_i, x_{i+1}, ..., x_n)
Then the y_i make an increasing sequence 0 <= y_1 < y_2 < ... < y_n < 1.
You can multiply all the y's by a constant like 200, to set the range of the y's
So use x's as parameter to optimize, and then compute y's to pass to your function.