After posting this I think this gives HGL an unfair advantage. So I'm putting the 84x's back to side by side and flat.
HLG also sells smaller boards that could have been used in this side by side. The Rspec isn't ideal for a 2x4. I feel it is still a fair comparison being it has four boards and equal watts.
Edit: The method I would do though is have two lights like I had the 84x's. I would stretch the plant out over the
screen, then place the lights a little closer together and flat once the screen filled out. I would also flip to flower at that time. I am also going to try to defoliate them both equally.