You'd be better off to check out a program without 120% overloads. An occasional static hold at more than 100% is OK, negatives are more of a once in a blue moon thing. Their effectiveness hasn't stood the test of time. Check out Elitefts, Westside, Metal MIlitia, Big Iron, Supertraining Gym. Whatever looks good to you. These are current, tried and true. No disrespect intended to the writer of the program you bring up.
Find someone with your general build and age that you'd like to emulate. Find out how they got strong. Good luck.