Have you tried the carbon fiber headband for your LCD3s? Expensive, sure, but worth it.
Man, I wish I'd seen this before selling them. Or actually I wish it had been available back when I first purchased the headphones.
I did order some alternate head bands that were supposed to more evenly distribute the weight. But I had to order from Europe and they got lost in the mail. I'm honestly not sure if it would have made a difference. Apparently I have a sensitive head - I see very few other people complaining about headaches. And I just can't understand how people can enjoy music for more than 30 - 45 minutes with that much weight / pressure.
Most likely because I was spoiled by 598's (literally the most comfortable headphone I've ever owned) and the X00's aren't far behind them.