Focal Sopra n1 - mids are a bit recessed compared to Lumina IIs

I would measure your room for starters. REW is free software, you just need a mic. 
 

Recessed mids seems odd for a focal but I have not heard the Sopra1. In general maybe toe them out a bit to knock down the highs which might push the mids more forward in perspective. 
 

Worse case cut your losses and try again. I have found Revel Be line to sound similar but be smoother in frequency response. The 126be might surprise you and save a bunch of money. 

Ah, the dealers/pied pipers/V curve ferals, etc have started to arrive for damage control and stating that the OP’s experience is illegitimate. These dudes will soon claim "It’s not the speaker, it is you!!"

On a half moon night for exactly 14 mins before midnight, the lush chocolatey full bodied mids of the Sopras will pop out, right boys? Mmhmm.

I auditioned the Focal Kanta 3 a couple of weeks ago with a McIntosh integrated and found them to be as you described with the Sopras, good bass and highs but poor mids.

I'm a Sopra No2 owner.  The Sopra's are very sensitive to where they are placed in the room.  If you get them dialed they will sound wonderful.  The Sopra's will work very well when placed closer to the front wall than most speakers.  This will give you room gain in the upper mid base and smooth out the presentation.  In the Focal owners manual, it describes a very specific ratio of distance between the side and front walls.  Start there and tweak as you see fit.  As others have said above, the Sopra's don't need much toe in.  They will still image like crazy unlike many other designs when not toed in.  This will help keep them from sounding tipped up.  Good luck and cheers.

If you don't have 200-300 hours on them I'd patiently wait them out. I heard how everyone called Sopra's bright until they broke in and settled down and it really does take some time. Now they're just slightly forward and very detailed. He patient and try different positioning to see what works for you. This really took me a while with my Sopra 2's and was discouraging. Now I'm super happy.