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I may be misunderstanding your issue. The miter gauge itself should not be that difficult to square. Typically, they have a big clamp handle that can lock it in at any angle. You can, and probably should, ignore the factory "pre-sets" and just square it to the blade with a good square.
That being said, I have used MANY different types and brands of miter gauges in 30 years and I use the Osborne EB3. It is accurate right out of the box and can be reliably set to any 5 degree increment between 45 left and 45 right including stops for 22.5 on both sides. When you go back to 90, you do not even need to check it, it is 90.
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My first thought is that the set screws might have been over tightened at initial setup by the manufacturer creating dimples at the point of contact to the miter bar thus creating in effect detents for the set screws to seat themselves back into those dimples. I have no fix for that but it might be worth looking into.
I have an Incra miter gauge for normal use and set up my OEM Delta miter gauge (semi-permanently) set to 90* (not set using the detents, just locked in place with the knob) with a zero clearance backer.
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I have this saw. What I did was loosen the three screws for the detent bar. Square the fence to the blade an lock it with the handle. Then flip it over and tighten the three screws. The locking knob should keep it square while you tighten the screws. This worked for me until I got an Osborne.