Old 04-14-21, 07:44 PM
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To close the loop here, what I ended up doing was completely unpredictable. Since the pull ratio of the new lever was higher than the old, I essentially lengthened the lever arm on the derailleur. I got some of that epoxy that compares itself to "metal", and I put a tiny blob of it on the tip of the derailleur arm, above the bolt where you connect the cable. Then I ran the cable *over* that blob and back down to the bolt. (I carved a tiny channel for the cable to rest in.)

It works perfectly. The full range of the lever produces the full range of the derailleur, and the stops are in the right places. I'm very disappointed that Shimano doesn't just do this for us, providing 2 connect points on the derailleur arm.
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