Took my new CX21 out for it's second run to continue breaking in Mercury 250 ProXS. I have an Atlas 10" hydraulic jackplate and running a Fury 3 24 pitch prop solid plug in 100%. I noticed when I was doing short run up on rpm for break-in process that my boat started chine walking at 66 mph. I feel like I tried every jackplate level and worked through trim ranges and always starts walking at 66-67 mph. Love, love, love the boat!! Those that described the ride as buttery are 100% correct. Any advice on eliminating the chine walking would be greatly appreciated. I am going out of a Ranger Z521 w/ 250 Evinrude G2 and never had this issue. I haven't read of anyone else having this problem.