Here is what I do in mine and has always worked for me. #1 you cant have different RH% packs in there. That is a humidor no no for sure. BUT that said what I do is I use the Bovida packs as a regulator of sorts. I will have PLENTY of Bovida in there and I will add kitty litter crystals in a small tub of distilled water and it will give off LOADS of humidity but the Bovida will suck up the over humidity that the Crystals give off. Once my packs feel nice and juicy I will remove the crystals and the packs are good for several months on their own. Once they start to even feel a little crunchy I drop the crystals back in there and were good to go. In doing that as many times as I have, my hygrometers (3 in there) rarely ever change but 1% point +-.

Good luck!

Cheers
Jay