Pay attention to your RD cable - I think you'll see fraying at the Jtek adapter.

I used a Jtek Campy10/Shim9 adapter for a short time. RD cables that typically lasted >10,000 miles would last only 1,000 miles before they'd start fraying inside the adapter. I believe these adapters simply exceed the minimum safe bending radius for gear cable. I had two cables fray right at the adapter in very short time, then I eliminated the Jtek adapter and normal RD cable life resumed.

Actually I never had RD cables fail at 10K miles - I'd just change them as insurance. I've had top-pull MTB FDs that would regularly destroy cables at ~3,000-5,000 mile intervals. The cables were bent too much at the FD cable clamp from normal shifting action, and would fray right at the clamp and break soon after the first frayed wire.

This experience occurred with Jagwire cables - the more (2x) expensive Shimano cables might take this abuse better, but I suspect not.