How do you know a broadhead is on straight when it has been sharpened. The "point" is not as pointed when you first attached it to the arrow and it spun perfectly, no wobble.
In other words, I attach my broadhead to the insert, apply glue on the insert, push it into the shaft, then spin on a flat surface and hand turn until no wobble. I then shoot it to see if flight is perfect, then sharpen...but when I sharpen, this affects the shape of the broadhead right down to the point. It might fly perfect, yet spin with a wobble?????????

If you took care with your initial spin testing and aligning,I'm sure you will be fine.You take roughly the same amount of metal off each side.Your broadhead will still be balanced even if the tip has changed slightly.

If your "spin on a flat surface and hand turn until no wobble" you probably don't have it straight.  You need to buy a spinner.  IN 3 Rivers they're called Dixon's Broadhead Aligner and Large Spin Tester.

Or Get a shoe box
and take the cover off. Cut a V in each end of the top edges of the box so that an arrow will rest in the V's (parallel to the shoes that
are not in the box). Place the arrow to be tested in the V's and get a piece of paper that is a little higher than the height of the
box. Now place that piece of paper parallel to the end of the box so the arrow points at the paper and draw a dot on the paper where
the arrow points. Point the arrow at the dot and rotate the arrow. Any point that's true will point at the
point throughout the rotation. An arrow that's untrue will rotate around the point.

Your method could get them straight.  This method assures straightness.

Bowmania