white widow, week 8, nute ?

Hello, been growing my white widow for a while and entering into week 8 tomorrow. Currently i've been running humboldts gravity at 50% strength for 1 week, and im startin to see some good results. I also have dry kool bloom, do you think i should add this along with gravity, or would that be too much for the plants? I was thinkin of adding dry bloom at 50% of what package says, as well as gravity at 50%. Hopefully this will let them somewhat balance out since they are pretty strong nutes. If anyone has any experience with these nutes advice would be greatly appreciated. I will post pics very soon, just gotta find my cable.. Thanks guys.