I have only sewn on Heat'n'Bond lite. Even it is a bit stiff, before it's been washed, so I'm guessing the the Ultra would cause many skipped stitches. Personally, I would heed the manufacturer instructions and not sew through it. I have never made T-shirt quilt, but I have heard that many quilters use Pellon Featherweight interfacing.
https://www.walmart.com/ip/Pellon-91...kage/358399946