This could be due to the weight of the barrels, I shot a friends newly acquired 32" DT11 today on a full round of ESP and it is a superb gun in every way. I noticed that like the 682E barrels there is no mid rib in the last 10 or so inches towards the chambers, not sure if this is also the case with the DT10 ?
This friend just replaced his 30" sporter 11 for a 32" one with factory Trap adjustable stock and it is a big step forward in feel and sight picture compared to the standard version which is getting a well deserved reputation for being too low in the comb.
In answer to Bostonmick, the changes to the gun from 10 to 11 are largely marketing oriented such as massively overbored barrels to aid recoil reduction and pattern quality (we need a Pinocchio smiley) but any gains are utterly unprovable on paper. If you can spare the extra £2.5k the DT11 is a lot of gun for sensible money (nothing is better from an engineering view point) but it won't outshoot or outlast a DT10.