Try using a 1000grit (https://www.amazon.com/gp/product/B07DPQPFM5/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) under a planer blade in a jig, for 30 secs or so, then test flatness and true. Probably save you some grinding.
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