Coop, your enthusiasm is fantastic, but IMO if you put as much effort in to progressing on the program as it is written, rather than how to change it/add to it/modify it etc etc then you would be even further along in your progress.
Get good at the basic program as it is, then get REALLY good at the program as it is, then when GL thinks you are ready HE will add bits for you.
This philosophy is working well for me mate and at about 15-20 years older than you, I am getting some of my best progression i have had in a long time, I am confident that if you just ran it as it is (even for a year) you would make amazing gains in size and strength...
TEAM CROM (supporter) !!!!