Congratulations Nkj,
I've had my Berning with all the upgrades for several months. Just wait till it breaks in. You ain't heard nothing yet.
Also, I recently rolled NOS Telefunken 12AT7's in and more recently, NOS RCA 12AV7's. They made a huge difference, both of them. The detail and focus is amazing. With the four TF 12AT7's in place my Berning is a little cool sounding, but I love the detail. However, I may try a pair of Mullards in place of one pair of the TF for a little more warmth.
Good luck. The Berning is simply an amazing amp with very few peers. And Allan is a fountain of knowledge and a great guy ta boot!