high rh 3rd wk f out of options HELP!!!

basicly i cnt shift my humidity below 60% at night and feel ive ran out of options. not to bad in the day wen the light is of and the weather is warm outside gets to around 50/55 if im lucky but mainly its around the 60 mark. few bits of info witch i hope will give u an idea of my setup. im growing blue cheese in dwc 18ltr bubbler buckets under 600w hps, 2x 125a inlet & outlets and 6" ocilating fan in 1.2x1.2 tent as this was fine untill i went into flowering when rh crept up daily as they grew witch i was aware of so i added what i thought nessersary to combat this. 1 15" static fan 2 moisture traps and small dehumidifier that has no affect realy and like i said in the day its about acceptable at 50/55 if warm outside but the warmer eves now is another issue temp 75-80+ at 60+ rh and day 68-72 at 50/60rh any help on this would b massivly apriciated..GRILLED CHEESE :)