I nave a question for those running 2x9 with X0 twist shifters. What is best: leaving the top clicks unused (like you had no big ring) or leaving out the bottom ones (like you had no granny)? The first option makes more sense to me as it would not allow to downshift too much and create a lot of cable slack. However I'm a bit worried you may risk to break the shifters internals if you overshift (the fder could not move anymore and the cable would put a lot of pressure on the ratchet mechanism that is not at its bottom).
Is this an issue in practice or nothing to worry about?
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Thread: 2x9 with X0 twist shifters