So given the low end issues with them and a slightly harsh high end not in the running long term
There's nothing in the F36's spinorama measurements that stand out as causing that harshness. I see a directivity change (slope change) at the midrange/tweeter crossover range that might indicate minor midrange and lower treble issues; plus the dramatic drop off below 60 Hz that would indicate it needs a subwoofer. Overall, the F36 is probably in the top 10% of the 2022 loudspeaker market for neutral sound. But always go with your gut.
https://pierreaubert.github.io/spinorama/speakers/Revel%20F36/Revel/index_vendor.htmlYou can do a lot worse. I thought the Olive score bottomed out at -1.0, but Pierre recently posted a bunch of stinkers that are around -2.4 to -6.4.
Edit: on second thoughts, that directivity change means the treble has the same slope angle, but from a different starting point. Perhaps I can see why it can be perceived as harsh. Directivity matters, otherwise we'd expect loudspeakers with the flattest listening window to always win double blind listening tests (and they don't).