I tend to agree with @gaidax.It's on if you want to build a dual handed frenzy barb, but if you want this choice to be an optimal one, you are forcing a lot imho.
Optimisation of DPS for me with frenzy barb would be to choose a set-up where you don't already have filled the 'what do I do with my bonus action'. Frenzy barb choice will be an answer to that 'use it for a additional attack (or a, throw)', that is mostly what this class brings.
So considering that it can not be optimal for a dual hander who has already an answer to this question.
Now that is all good but this - 1 cumulative really kills the class in my eyes, so there is that
