74 degrees would actually make it iffy getting my Brooks in the right position. Brooks doesn't have a large adjustment range, and while a degree at my frame size is only about 1/4" 73 is already tight, and 72 my preferred position.

I don't know what others have found, but I haven't found spec sheets all that accurate in the past. There seem to be numbers people are looking for, and those numbers get standardized across frames and are not what the bike actually measures. You know, you look at a list, and find the angles are the same between different sizes, the stays are the same length, and the wheelbases are the same, but the top tube lengths are different.