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4" Rucks are about 265m3h (165cfm) and 5" are about 365m3h (214cfm)
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Here is my

if u only have 165 drawing air in thats all the extrator fan can work. Try removing the intake fan. take the temps. Passive intakes work extremely well. You may need to make the passive intake larger, or open another slot in your grow tent.
or maybe even open another slot and keep the intake fan? who knows, i think it has to deal mostly with the non passive intake not getting enough air in.
If they are still high use your intake fan as a 2nd extractor fan.
hope that helps