PS3 Transfering trophies to other users with different Account ID

[GuilloteTesla]

Additional advice:

If You successfully synced trophies with servers and You are sure that everything is listed from there, then log out from SEN and rename or delete trophy folder. After that log in again and sync trophies back. This way You will get 100% valid trophy sets for this console and account (because data on PS3 is rebuild from data on servers, and data transferring to servers aren't the same files which lies on PS3 HDD).

I think this is key to have consistent trophy data. Nice one @Berion!.