As you say, it may just be a lost cause. I'll give it some time
though--partially out of curiosity and a seed of hope here and there.

I'll get a pro to make my next board, but I may attempt one or two on
my own in the meantime. What do you think about cutting up some craft
maple/walnut and press gluing to mdf,,,assuming I can cut excellent
squares by clamping my fence down.