I have a very limited amount of knowledge on Ben 10 (as I haven't watched it since I was a small child), and even less about this particular variant of it since... well. I never watched it.
With that said, my perception of the verse is that they display basically normal movement speeds (that is, not Immeasurable) throughout. They do not have some weird form of movement that makes Immeasurable consistent. It requires a particular interpretation to justify Immeasurable, and I think that taking that over the showings of the rest of the show is a bad approach, especially with such a weird feat for Immeasurable.
As such, I'll agree to the downgrade for now. However, the OP currently gives no proposed destination: just that it should not be Immeasurable. The profiles seem to largely scale to MFTL+, is that the proposal?