Here is the math:
Perfect minimum base damage: 779
Perfect maximum base damage: 945
Perfect minimum elemental or black damage: 1199
Perfect maximum elemental or black damage: 1490
Perfect minimum damage = 779 + 1199 = 1978
Perfect maximum damage = 945 + 1490 = 2435
Perfect DPS = (1978 + 2435)/2 * 1.10 = 2427.15
Now with the 10%, assuming the elemental damage is black to take full advantage of the enhanced damage, the perfect DPS becomes:
Perfect DPS with black damage and 10% = 2427.15 * 1.10 = 2669.865 (about 2670)
If you have elemental and not physical damage (e.g. Fire and not black damage), then the 10% applies only to the base damage and not the elemental part.
Perfect DPS with non-black damage and 10% = 2522.19
Once the new patch arrives, this issue of elemental versus black damage will be fixed.