Can't you do something to the elevator that it stays a little bit longer on the ground before going up again, so one can roll in? It lifts too quickly, and since turtle doesn't have enough room to gain speed there, entering the elevator does not work.
I can't get past that part with the ramp and the little elevator in the waves section. For some reason, I never get the timing right to get on the elevator, because the movement of the black dots and the movement of the elevator make it impossible to get in. HARD.