Having trouble with miter....

I'm trying to create a repeatable 60 degree miter on a RAS but am having a heck of a time getting my miters exact enough to have no (or at least an even) gap between the pieces when put together.

I'm using a professional quality RAS. I've set the saw to 60 degrees, cut the first angle, then used it to place a stop block on the saw's miter table. At 60, the triangle has gaps in the center. To compensate, I set the miter to 59 degrees. Now the gap is on the tip of the triangle.

I've gone through several 1*4*6' trying different tweaks, but no luck. Any suggestions? I've uploaded a couple of pictures showing what I'm trying to do and the angles I've come up with.

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Having trouble with miter....