Westside is all about modifying your training to make it work for you. George has modified the basic program to work for him. So has Chuck. They still do a lot of what Louie tells them to, they just add in the extra stuff that they know they need. They are the elite of the elite. They know there bodies better than anyone else. It's the same with everyone. You will know your body better than someone you talk to. It just takes some time to learn to listen to it. One thing I try to get past to people is to try the basic westside program for a while before they go changing it. You aren't going to know if something works if you only try it for a month or two. In my own case, using the basic routine laid out by Dave in his BIG, BAD, BENCH article, I added something like 50 pounds to my bench after coming from an injury. So I will keep trying the basic work until it stops working then change it. This may be next month, next year or never. Who knows, only you can decide when your not getting the results you want, at that point change it. That's the great thing about Westside training. It keeps evolving. Since it was started, it has changed immensely.
And as much as some say that the Westside boys don't train there pecks is mistaken. They do timed db presses. Has anyone tried them? My pecks are slightly sore for a day or so afterwards. Any kind of bench will hit your pecks to some degree.
Now having said that, George and Chuck and all the rest broke many plateaus using the basic Westside training. Think about that before you go changing it. How many of us have achieved the numbers that these guys were stuck at before they modified there routines? Very few.
Sorry for the long post, this is my opinion. Take it as you will