The XA drop is approximately 45$ (from 74 to 30). Based on this leg, the leg AB should be approx 61.8% of the XA leg (TRUE because 30+ 26 = 56 ). Secondly, the BC drop should be approx 61.8% of the AB leg (TRUE because 56-17 = 40, where we are approximately NOW ). The BC drop is a congestion zone and the pattern usually takes longer to resolve in this area. For the pattern to be completed, the AD leg (rise) should be higher than the XA leg in approx 27 to 61% although I placed the point D at the same high than point X just for drawing.