Yep some of the linkage holders are not what they seem. First off you need to adjust the ball link as close to thr centr of the servo arm as you can. You only need about 7mm length on the arm. Or attach to the outside side of the arm away from thr boom. If that is not possible you may need to move the servo closer or further away from th boom to take the bow out. Another thing to do is drill the hole in the rod guide closer to the boom. Some times you have to change a little to achieve the result that your looking for. You need to have "NO Binding"

Good luck,

Jim