Would you mind explaining the purpose of DT1 and DT2?
Never heard of it

I can't do it better than this:
https://bitcointalk.org/index.php?topic=5096445.0 A short introduction to the Trust System
You may wonder why there's no list of users there, as I've explained above, but rather a single entry called "DefaultTrust".
DefaultTrust is a special user who maintains his own Trust List.
The Trust List of DefaultTrust includes the names of those preset users I've talked about.
Beneath the list, there's a value called "Depth". This value represents the number of "steps down" which the forum's software will look into Trust Lists of people in your own Trust List, to construct your final, complete list.