You went from a linear program to another linear program and added a BBB set and accessories. You pretty much doubled your volume. Of course something will happen.
And this is today. Make sure your TM is where it is suppose to be. Stay with the prescribed reps (5/3/1 sets) until your body gets used to the new volume.
It's called DOMS. Yes, three days later. When was the last time you worked 5x10? And eat more.
If the template is on line with your goal(s), then do as is.
This is a goal oriented question. Only you can answer that one. As long as you follow the philosophy, you are golden.