By the text I would rule "Yes". I seems logical that you are even harder to see the more you scale the spell up, probably reaching something close to invisibility with enough power invested. (Similar to the elves in Eoin Colfer's books, shimmering or vibrating at very high frequency, too fast for the human eye.)
However, compared to bless for example it would be a +5 to only one of the two, and you decide which one you want to scale. Probably should be my last thought as the scaling option would be too cheap and too powerful if my first thought was used.