Great thread! I usually try main line Kings Indian with white going for bayonet attack but I have a terrible score with it. With black pieces my best result was a draw against caissad4. Perhaps the London is a less complicated way to play and a very good sideline?
I'm beginning to love one of Yasser Sierawan's early pet lines vs. The KID. It includes an early Rb1 with b4 and c5 ideas. It's the best plan I've seen against the symmetrical and looks simple and awesome against the KID.
Might be worth a look for some of you c4 players.