I use these in mine. Throw a few in each Tupperware. If I have extra (I bought a larger pack) I line the bottom of my biggest Tupperware. When I get a new Tupperware when I inevitably run out of space I have “pre seasoned” cedar blanks I can pilfer from the big Tupperware.
So, I was in the same boat not long ago.I only had a small assortment of cigars and threw a boveda in a tupperdore. My readings were all over the place and I was distraught.
First things first. Calibrate your Hygrometer, MAKE SURE it is where it should be. Give this a try
Also, Get some cedar in there. Cedar is great at many things including soaking up some of that humidity and helping keep a nice steady environment. There is a reason real humidors are made of it. I used a couple of these blanks from Amazon
Now, After all this is done, GIVE IT TIME! It will take at least a week or so to settle down to a normal RH. Don't panic and just trust in the Boveda pack.
I ordered some Spanish Cedar pen blanks off Amazon, they are very nice. https://www.amazon.com/dp/B00BYGL0F8