I made some search and didn't find any more details about program. Anyway, it seems volume is not critical. But, what kind of exercises you make weighted?? What weight? All kind of jumps are stressfull enough by itself, you don't need to put additional weight. At least you are really good conditioned and even then you should be very carefull with adding any weight. Personally, I don't agree with adding any weight in plyometrics for sport purposes.
I guess it would be good idea to ask Jacob 1 on 1 or on their forum, where people do same thing and ask for experiences. I would say, if you have pains, make some pause, go back few weeks in program, continue from there and avoid any weighted plyometrics. Add weights when you'll be very experienced and well conditioned and if you'll still think you need weighted plyometrics for progress, add them smart.
BR, Gregor