I have had 2011 and 2012 T1s (not the DB version though) and I love them. Have you heat molded them with a pro? I found that to be really critical for getting that broke-in feel out of them. I ride in a variety of terrain and do prefer a stiffer boot so I've found them great for all of the above you've mentioned. I'm an old-school rider and I like riding fast and laying down a lot of carves and fast edge-to-edge turns. I have not had to adjust the pad to open up the flex in the ankle as I find the default position to be good.
As for durability, the reason I've had two pair in two seasons is my heel-cup of my binding wore holes through both outer boots. I sent the boots back at the end of the 2011 season and K2 replaced them under warranty with 2012s for free. Awesome service!