"I only have the old 24 TS-E with it's smaller image circle. When using tilt I have found it pays to also use a little shift to "re-centre" the image circle, as I occasionally did when using wide angle lenses on sheet film. Obviously, a bit of composition juggling is required and, in the case of this lens, re-orientating the shift axis.
This may work the 17 TS-E?"
I used to do that on 4x5 sometimes as well. It won't help the 17 t/s-e because as soon as you tilt it the upper corners go to crap, and it's not just the corners. As good as these lenses are, they're not Super Angulons.