Please help with lowering humidity, what can I do to settle it, i have a 5inch inline fan, 5 inch extraction with a carbon filter and small dehumidifier

If you are able to set up a heater/infrared in your lung room, I know this will sound odd but at times I need to do this, the air conditioner keeps temps in the lung room in check compensating from the increase in temps from the heater but the heater will decrease the moisture in the air fast, make sure you can pull this dryer air into your tent and it is exhausted outside and I bet you can lower your humidity very quickly - it will cost more to keep the room cool and from heating up. I have dropped my humidity down in my lung room from 70% to 50% in less than an hour.

Theia is correct, only a bigger dehumidifier will save you. In the short run, you could cut off all of your fan leaves. Look into schwazzing technique and see if it works for you. This will bring the RH down a few points and also greatly increase airflow, which helps with mold. Schwazzing scares the hell out of me, but I would do it if my choices were that or bud rot.

Place a kilo of rock salt in a wide container and make the fan point at the salt.

buy a bigger de humdifier. i know it sucks to have to send again. I just bit the bullet and got one that would do a much bigger space then needed and handle more L/Hr then i needed. Its no longer an issue. Good luck.👍