If you are not looking at replacing your preamp with a balanced unit anytime soon, then yes, going with the Jensen transformer would be the best route to take and provide the best results IMHO.
There are advantages of running bal. to bal. (given both circuits are true balanced)but this is not to say that the conversion would not still provide very good results. Regardless of the route you take, you should not have any impedance mismatch as the Rogue has a very low output impedance and most BAT amps have a high input impedance.
I still think the transformer route will still give you a better sound but that is only my personal opinion.
There are advantages of running bal. to bal. (given both circuits are true balanced)but this is not to say that the conversion would not still provide very good results. Regardless of the route you take, you should not have any impedance mismatch as the Rogue has a very low output impedance and most BAT amps have a high input impedance.
I still think the transformer route will still give you a better sound but that is only my personal opinion.