Hi take a read this one
I had problems with X1C and had to drill a small whole on the side of the extruder case to be able to adjust the tensioner , one for TPU and full on for other materials , kind a level to which can grip but not to jam it
Also very important to adjust the retraction and feed speeds , and print speeds
I had a good success with TPU 70A , for TPU98A probably only extruding speeds and print speeds will be enough , also needs to be dry and automatic flow did not work for me at all so manual Linear preassure advance
Did not modify the feed in but from standard external spool holder and carefully manual feeding it , AMS is impossible. Jammed twice the extruder before i get it working and a few hours experiments and tensioner fix .
Hope that helps