So basically, you're doing the same thing again.
You' are not the arbiter of how to gauge support. You have, apparently, little understanding of why local bases of support carry a strong meaning in Palestinian politics vs. overall support. You seem to be importing USA/Western notions into this, I don't think the translation works that well.
If the PA was half as sure as you are about them figures accurately representing support, they'd be far more willing to hold elections by now. They do not.
Significant is significant - you want to argue that 20%, 30% or whatever is not significant, that's up to you - nitpick away. I will comment again that the Hamas crowd and support, being more into extreme and religious views are (as I'm aware of things, at least) easier to mobilize. Coupled with reputation for violence, that's a factor.
Tell me again how you're not nitpicking. Or better yet, don't.