I've come to the exact same conclusion, it's all about the burn temp. I've found that the stickier/greasier the weed, the more profound the difference. As I mentioned in an earlier post, I believe it's the combustion temp of the essential oils and terpenes coupled with the amount of them.
I also notice with the thinner paper that my buds burn grey and up inside the paper, almost like the paper is choking the weed out, but the thicker Ziggy blues...burns really well, tastes much better and I get noticeably higher.
...and fuck RAW papers. Hands down the last paper I'd buy, and I'd drive an hour or two if I though I could get some loose leaf paper and some scotch tape instead.