Me work is done by feel and experience. When I first started WSB training, I would switch ME work after three weeks. Now, a year later, I usually switch up every two weeks, the exception would be Rack Pulls, which we only use for a week at a time. DE %'s are changed based on where you can exhibit speed. I have a hard time working over 45% for DE work, I usually only change the bar weight, but keep the % the same, after setting a PR in a contest. Assistence work is done by feel, you know what muscles you need to work, and how long you have to accomplish that goal, pick what works well for you and use it until it no longer provides the results you want. Then switch to another movement for the same muscle, and use it up too.

Ermantroudt