I have tried to develope a Westside O-lifting template in the past and found the max effort (90-120% lifts on olympic variations) to be useful, but dynamic effort as it is currently used seemed to be a waste. It's already been mentioned that singles with 60-70% would be like using a whiffle ball to develope speed.
The dynamic effort method is used in the weight range that develops the most power when used for squats and bench, and with squats and bench max power lies in the 40-70% range depending on who you talk to. With Olympic Lifts, max power development occurs at 100%. Also, for example, I do squat cleans with 225 and have a max back squat of 395. That's like a "dynamic" squat with 55%. If I go for a max (currently 265) that's like a squat with 67%.
My current routine has 2 max effort days and 2 "volume" days. On the max effort days I max on snatch or clean & jerk and back or front squats. On the volume day I do squats and variations of the lifts or the classic lifts themselves with 70-85% for 2-6 reps (more on pulls).