Use your linesman rope in conjunction with your tether. Linesman tight (above your waist) as you move your tether. Tether tight as you move your linesman. Seems complicated at first, but after a little practice it’s easy. Besides, it’s only two-three moves.
however you move your tether (as stated above, which I’ve tried both and still have the G3D pieces), as you step up you really only have a single point of good contact with the tree (the toe in the aider that’s buried into the bark). With the addition of a tight linesman, you are more stable as you transition up. But, that’s just me and how I do it after long talks with guys that climb poles for a living.Good luck, stay with it, it gets easier each rep