2

This sounds like a situation where you should have a professional bike mechanic look at the problem. If you have attempted to resolve the problem by adjusting both the correct limit screw (you did make sure you were adjusting the correct limit screw, right?) and the indexing via the barrel adjuster, then something else is wrong. One possibility is that ...


2

34 is likely too much. Nowadays short-cage Shimano RDs tend to allow 28 and 32 could somehow work, as the specs are very conservative, but 34 is likely too much. The extender should work, but the shifting will not be that precise.


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