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@JB
It's not really. It's just a the proper angle to accommodate a setback post. A Tarmac in a 52 and 54 has a 74 degree STA with 72.5 and 73 degree HTA, respectively. So it's not unusual.
When we designed the Seven, we were going to go with 75 degrees for a setback post, but I didn't like how steep it looked against the 71 degree HTA, so went 73 degrees for an inline post.