Why does my house still smell Like Marijuana!!

problem with high RH areas where scrubbers are is they tend to plug up from moisture etc they always say place scrubbers high in corner etc but heat rises and where there is heat there is humidity
i like the idea of having a room in a room set up where scrubbers are not in grow area but rather outside em almost like a 2 stage scrub before it exits least this is my goal on next room i build it exits the grow area into lung room carbon attached and another fan pulls it back in with fresh air mixture then out for good going out another final scrubber so 2 scrubbers per 10 x 10 grow area
now to figure out the havac

like said above too high humidity kills filters

If your carbon Filter has a cover try washing it and putting it back on.

crbon filters = beating the hell out of it every now n then to unpack it just sitting there little moisture and pow you got like a cement mix lol add soe RH and other air borne contaminients and you got one big rock lol

You are not pulling 420 cfm (the min required) if you have duct work attached to that fan.

Cheap test/fix, wrap the bottom 1/2-3/4 of your filter with saran wrap let run for 15 min and see if you notice a difference.