Canyon Ultimate R8000 front derailleur - can't get low enough I have a Canyon Ultimate CF SL.

I have installed an R8000 Ultegra front derailleur. I am finding that even when the limit screw is dialed right out that when in the little-big combo (little front, big rear) the chain is still scuffing on the inside edge of the derailleur cage.

I have tried dialing out the lower limit screw, ensuring there is no cable tension, and ensuring it's properly aligned with the chainset. The chainset is 6800 50-34.

Any ideas what is going on and how I can rectify this issue?
Amateur hour. Turns out my K-Edge chain catcher was actually blocking the derailler from moving into the lower position. It looks like this chain catcher is not compatible without modification for use with R8000.