MoFi 888 making me mad!

I did have a similar experience with my 888's. I'd say I'm more patient but there is for me at least an18 day or so period where new has to become normalized to my ears and yes I played with placement. Good luck and keep them. I had tubes on mine and they were glorious and as well some Moon audio and some Accuphase and Pass; all great but Moon has the neutral and detailed sound that worked best. 

I bought a pair of Pure Audio Project Duet 15 Horn 1 open baffle speakers (half open baffle anyway as the horn is a horn) last fall and they took a LONG time to break-in...the 15" neo powered Eminence woofers needed to loosen up which was not surprising as an Eminence 15 in a bass amp I have did the same. They sounded great all along anyway so that was a good thing...the issue with break-in is when you prefer the sound of un broken-in things and have to get replacements every couple of weeks...but ya do what ya gotta do!

My Thiel cs2.4 speakers took roughly 100-200 hrs to sound their best.  From what I've read though it's important to leave speaker cables alone during this process. Of course experiment on positioning / toe in 

It may also be the nature of the materials.  Paper cones, cloth surrounds.  These fibrous materials may need more break in than say, a plastic or metal cone which are more inert materials.   

I purchased a used pair of Cornwall IVs in October of 2024, only to find the manufacture date code on them to be 2024!  That tells me the the first owner barely gave them a chance.  I did notice a smoothing out and opening-up over the first few months, but I was also changing setup, and trying different amps, so it's hard to say how much of that was break in....  I do admit to not loving them for the first week or two, but now I really do love them!   I do however, also want a pair of Sourcepoint 10’s!