"I was taught to flip one of the blade ends over and then grind the ends at the same time." Let me add: one end <1mm offset; and grinding both 45° angles at the same time. Then the exact angle doesn't matter.
The clamping spots should be at a greater distance, say, 2"; to give room for a generous flame >> brazing time just a few seconds
What saves a lot of adjusting: precisely aligned shoulders for both backs of the blade. Like one sees it on pfredX1's photograph.

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