As much as I respect you and love reading your posts, I'm going to have to disagree with some of what you've said.
A higher dome means that there is a larger pressure gradient between the top and the bottom of the disc. This means a disc with a dome will act more understable. The air over the top of the disc will differ in speed from port to starboard; the air over the top surface of port (for a RHBH throw) will be going faster relative to the surface of the disc than the air over starboard. Since the air on the underside of the disc won't differ much from port to starboard (the inside pocket under a disc is what creates the vacuum that produces lift), the dramatic difference in speed won't cancel out (The common, and incorrect, counter argument here is that since there's a ratio between the air going over the top surface and the bottom surface, it won't matter if the air going over/under the port surface differs from the air going over/under the starboard surface because their ratios cancel out...kinda like how 1/2 = 2/4. However, this is incorrect because of the vacuum I mentioned.). So, the domier disc will be more understable. A dome will always have that effect. If you've experienced otherwise, it would have to be for some other reason than dominess: perhaps some other aspect of the geometry of your discs. This seems strange to me, because I'm aware of the fact that you've thrown hundreds of discs. It's confusing to me that you noticed such a trend...