I think it is more of a commitment. Try 60 second static stretches after the muscle is worked and still warm. Althought i only use DC periodically, i still include the stretches in my routines. My flexability has improved considerably over the last year despite the increased muscle mass.
Doing any significant amount of stretching before weight training decreases contractile ability. You want to warm up prior to moving weights and stretch after.
The DC extreme stretches are a staple for me. I also want to look into acupuncture and deep tissue massage as I've heard both of these can help.
Buy yourself a foam roller and really get down deep into the muscle.