can you post a picture of him? Are you sure he isn't a sable? They are the only ones that tend to get more black. A B/T will mostly like have the black recede and get more tan on him.
ETA: found a picture. That puppy is a sable, not a black/tan. You may have registered him incorrectly.
Seger vom Sitz von der Hose
Forever loved and missed.....Banshee
~The strength of one's opinion should not exceed their knowledge on the matter~