Remember not being able to find anything below 60 my last go back in March. 56s and the solution came quick today for some reason.
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Yay! After just over 4 hours spent, I got it! Definitely the level I've spent the longest solving, even over any of my SGM solves. I loved the iteration process all along. Tons of possibilities that get you close, but cannot be brought all the way down to 54. Some of these comments imply that once you get 56 you're on the way to the solution, but for me getting a 56 was just the beginning of the grind...
Added this to my hardest under 100 collection. There are an incredible number of 58s here, took me days to finally hit on an idea for the 56 and then the final 2 cut is just genius.