I have about a half-dozen basses with scale length shorter than 34", and about a half-dozen 34" scale basses. I don't feel "a difference" between the 30 and 32" basses, but I can feel a difference between either one and the 34" scale instruments. I sure wouldn't notice the difference between 30" and 30.5".
Scale length really doesn't make a difference to me when I play, although I have to stretch less on the shorter scale instruments.
I think the Epi EB-0 models sound just fine, but they sure don't sound anything like my '64 Gibby EB-0 with da mity mudbuckerizer.