Hi Drew,
1) We do not have a livery for Vatsim only for the IVAO MTL.
2) Flight Logger is completely independant of FSINN, SB, IVAP and all other online clients.
3) Our callsign is "EuroHarmony" or "Harmony" and all flights should have the ID "EHMxxxx" The xxx should be the timetabel flight number but we are in the process of changing this is the ops manual so that it is your EHM ID number.
Hope that clears it up, give us a shout if you need any more info!
Good luck