You really don't want to go over 60% because thats when mold can form. I know they make these things called DampRid that can be cheap and effective, but im not sure you pull a room down 12% RH with them.
I use water crystals which would be a more expensive version of damprid but you can use it over more times. It swells up to 50 times original size...I put a 2-3 cups in a thick sock and stick it in Tupperware along with the green. Can be bought at ebay or can be found at Lowes in the garden section at about $11 for a pound size bag.
You have asked this in multiple places and I have given you answers in multiple places. No, it isn't okay, and just because the outside of the bud is dry doesn't mean your bud is ready to be jarred. You're never going to be able to cure with your RH 80% and 20C. Never, get a dehumidifier.