I think your first issue is that you've got 12 plants growing in a small area, x2!!! Even though your CFMs and filter match, you're still over-running your filter from volume, not from lack of ventilation.. I had this issue and still run into it with some strains.. It's almost unavoidable unless you ran a larger fan, larger filter and somehow made some baffling or a plenum near your air intakes so you can run them wide-open w/o air leaks..
I switched to a 6" w/ comparable filter and it was a HUGE help, although keeping humidity in a lower range (between 40-50%) can make a big difference as well..
Best of luck!!!
I switched to a 6" w/ comparable filter and it was a HUGE help, although keeping humidity in a lower range (between 40-50%) can make a big difference as well..
Best of luck!!!