Are you going through all the steps? Here they are.
1. Export from PTS.
2. Import to BTS 0.9.3.
3. Follow the procedures xeroc and testz provided to export from 0.9.3.
4. Then import THAT wallet into the new BitShares 2.0.
You cannot skip the 0.9.3 step because your PTS wallet cannot be imported into 2.0 directly. Also, you need to properly export (see the directions) from 0.9.3 because there is a correct way and also an incorrect way to do that.
I believe there is no need to synch any of the old wallets.