Just saw this post, here's my advise:
For the new XT formula use, as advised on there website, a nozzle temp of 240 to 260 depending on the object and speed of printing.
Generally I use 240 up to 30mm/s, 245 from 30 to 50mm/s, 250 from 50 to 65mm/s, 255 from 65 to 75mm/s and 260 above 75mm/s.
Bed temp 56 degrees.
For adhesion to the bed I always use kapton tape, nothing else.