I have been enoying Helck, but it has been a slow burn so far story-wise. I have high hopes since they are doing 24 episodes that as the story builds, we will get some payoff later. Also, I have heard great things from source readers, so I am hoping that all the establishing and character building we are doing now will really benefit the show as it goes.
You should finish the hueco mundo arc because there are some callbacks to it and it's just an awesome arc with a great finale. Skip the fullbring arc and continue with thousand year blood war.