bigger nozzle .5mm or larger, slow speed 8-10mms, No retraction, gravity feed with bearings spool support so filament will pull really easy. Adjust extruder tension while printing to get the best pull without locking up the filament drive (assuming tension is adjustable on the particular printer) TPU is not easy to use and is never going to work like PLA no matter what you do. The lower the hardness and more stretchy it is the more issues you will have..
Good luck!