From the first pic, looks like they are pretty close together. The COBs section should receive quite some cross lighting from the QBs. You can turn off the COBs and see the amount of light the QBs pass onto the COB section. When you do it the other way round, you will see not much, if any of the COB lights on the QB section.
You can get the boards much closer (Dim) to the plants and still get very even spread.