Sorry for the delayed reply. I actually don't use the London anymore. I switched over to the Boris Becker Delta Core NYC. From London to New York! My NYC is heavily tail weighted with a few strips at 10 and 2 o'clock. It is now at 11.9 ounces, 316 swingweight and 7 point head light balance.
I usually have it strung with a full polyester setup at 52 pounds.