My feeling is that at that height, the wind should blow your scent away over the top of them and disperse it so that they won't wind you from that direction. We don't have tall trees here in South Texas and my favorite stand is in a big oak that's only about 10 feet (platform height) off the ground. I've had the wind swirl during a sit so that suddenly it was at my back and blowing straight towards my shooting lanes (in an oat patch) with as many as 15 deer in front of me and within 30 yards - not one of them picked their heads up.

That said, I would take a wind tester and test what it's actually doing to your scent. Especially since you're on a ridge. Thermal drafts can take your scent straight down (or up) and in any direction, even when the wind seems to be perfect. Ridges are notorious for creating thermal drafts. It's ALWAYS a smart idea to use a wind tester (puffer) when you're hunting out of a elevated stand.

Hope this helps