I just measured my hand. 3 1/2" wide at the knuckles not counting thumb, and 8" from bottom of my palm to end of middle finger. Am I measuring the same way you are? If so, I bet it's more a matter of practice and conditioning than it is size. I had a problem with 34" scale (with any scale really) when I started but it soon got better. I play a fairly wide neck 5 string with a 36" B string with no problem and my hand isn't way bigger than yours. If the stretch on your present bass makes your hand sore or tender I'd look at maKing a change pretty quickly, but otherwise it may be normal adaptation that you're going through.
What you say is true... However, personally I might kill for an extra inch reach! That being said, it's all about practice. You do what you gotta do with what you got.