Regarding the new driver break in, I'd check with Cube to see if they ran those drivers prior to shipping to you...as that might be a factor.
They should sound good enough as you have a week and a half on them. You could try higher volumes and a break in specific disc / tracks?
Here is a response I sent to @toetapaudio on my personal experience with break in:
"....Cube, if memory serves me, felt a few hours of runtime would be sufficient.
Jon Ver Halen, the US importer, put it at 40 hours or so.
Based on my experience, I peg it at about 150 hours before the Nenuphar start coming into their own. They definitely started sounding better after Jon's recommendation of 40+ hours. So take 40 as a minimum, minimum...with 150 as my personally recommended minimum.
For 'full' break-in around 500 hours for musical beauty, wonder and engagement.
An industry person I respect and who has significant experience tuning analog gear, felt 1000 hours would be needed. I realize 'hours' of burn-in are a hot topic with folks falling on either side of the divide. I took his feedback and pushed for that 1K mark, after which I consider break in to be complete. However, If I were advising, I'd stick to the 500 hours with folks generally being happy with the results post 200 hours."