I just googled "kendo" and saw a peice of a match on YouTube. Pretty cool! Apparently kendo means "way of the sword", so I get it now. I just started karate last December, and am slowly beginning to learn about the differences between various martial arts. Two students in my class had taken shotokan karate before, and have had a hard time changing habits. I can understand why you can't practice two disciplines at the same time without getting muscle-memory issues!

Definitely stick with the LC, and try to introduce only enough carbs so that you can complete your practices without bombing out. The closer you stick to 20 carbs or less, the faster your body will adjust and get it over with. LC is the way to go for muscle-building and recovery.