I've said multiple times before: DT2 members should require to be included by at least 2 different DT1 members (maybe even 3) in addition to having a net positive number of inclusions. This removes all the "soft" inclusions as well as removing the issue of people artificially inflating their own trust scores.
I must miss it all the time even if it was said by anyone else too. This seems a very good idea to improve the DT2 network. The current rule is too vulnerable, and it needs one guy in DT1 to make a mistake to include a scammer. Give it to the hands of x guys. X must be greater than 1.