In the IG thread you said if QBA is lower, IG is higher, and vice versa. Yet in your AM set your QBA is 3 with IG 57. Then in the Pro set your QBA is 33 and your IG 67. That's a contradiction. You've obviously concluded skill level plays a factor in how IG correlates with QBA, as does threshold, meaning there's no real "key" as the opposite of what you stated is apparently meshing in different sets.
Nevermind.