I also used the flat black paint method, though I went about it the hard way.
First, I tried tannic acid and aqua fortis. The finish got dark and muddy, obscuring the grain and curl. So I sanded and scraped all that back to bare wood. On the good side, ended up really smooth and completely whiskered.
Then I sprayed two coats of el cheapo flat black paint. This kind of freaked me out at first. However, after sanding and scraping again, the grain really popped.
Finally, one coat of LMF honey maple followed by two coats of LMF lancaster maple, thinned about 50%.
Finish is Tried & True oil varnish, 5 or 6 coats. Rubbed back with 0000 steel wool in between.