28" is well within the range of a 60" recurve. 2 nocks are used by many 3 under shooters, because of their higher brace height, and because the apex of the string angle is substantially under the arrow, which can cause the arrow to slip down the string on release. Maybe you have some of the same issues, even though you shoot split fingers. If two metal nocks bother you, have you considered tied-on nocks? They sort of merge with the string and are easy to ignore after a while.