Is it possible that the lights are burning them, seeing how its ONLY THE TOP Kola's?
i hope the ladies recover quickly and get back on track. raising the lights seems like a good idea, how far are they from the plants right now?
to the OP >
Do not add more intake fans.. Actually a simple passive intake is just fine..you need more exhaust. IMHO you need at least a 3:1 exhaust/intake ratio. If you need to lower temps, remove some/all of the intake fans and them to the top as exhaust.
Are the hairs starting to go red one by one yet? My strains usually start having a few red hairs and that is when I determine it being about ready to start the flush, take a good close look at your trichromes. Being that this is a CFL grow how does your lower growth look right now? You might consider harvesting the tops and waiting a few weeks and harvesting the lower growth later. Did you get the odor issue under control?