Blacktail,
Yeah, I use thin flakes and make arrow points out of them. But if they are large and VERY thin, then they'll usually break several times until they become a more manageable size. Large, very thin flakes are really difficult to do anything with because they break so easily.
But if you go slowly and carefully, you'd be surprised at what you can make out of those little flakes. I've made some small arrow points out of very thin obsidian flakes and they are almost covered in flake scars, just like some of the original ones I've seen from your area. But then again, I almost never make anything big....I just love those little exquisite and finely made arrow points more than anything else so that's what I make the most of.