Follow the program. After 7 or 8 months, you'll know exactly what you can switch up, what's weakest, etc.
Cycle your ME exercise every couple weeks, and don't be afraid to add a set or two to your pulling, especially on your back (there's alot of pressing in this program).
After a while, you'll adapt to the volume, and be able to either increase the intensity or add some sets, or both. Its worked great for me.