I've kept mine at 80, since I determined that sounded best... but I don't really recall going higher. I experimented mainly between 60 and 80, with 80 winning me over for the balance of better bass performance from the subs, and allowing the speaker to focus more above that which resulted in slightly more clear mids and highs.
Which begs the question if there is a balance point, so to speak, where the subwoofer stops offering a LF performance improvement against what one can hear up above from the speakers.
I might have to experiment between 80 and 100, just to see if I continue to hear any difference.
For my setup, I first mad the decision of 80 for the BMRs. With the 3s deeper extension and more capable driver, I thought 60 was good... but the pudding proved to still sound better at 80.
*shrugs
This will warrant some further examination.