No doubt that "over" would be more common than "under", but the mental image I get from "under" is a spatial one, and therefore I see a fraction in my head and not a sequence of values. I do think that the "until" does a good job of creating the mental image of a sequence. I can see "below" being slightly better, but I'm not certain that invokes the mental image of a sequence either without the use of "from" as well. Both "to" and "until" invoke images of time or perhaps extended distance (more so for "to") in my head, which translates into a sequence.
Of course, when you get into the connotative meaning of words, as this conversation is doing, you run into problems because those meanings can vary regionally by usage or even among individuals in the same social group.