You need to follow this important point below:
Do the fucking program!!!!!!!!!
That means stick to the BB bench which allows you to progress incrementally much easier than DB's. Don't do both, follow the program. Don't change things up, follow the program.
I think you get the idea now. Just follow the program until it's end then you can look towards this kind of thing. And don't worry everyone thinks of changing a program a little but we all need to just do the program as it was written.