This is based on my opinion:

I would not mix the two together. Beads work to keep the humidity stable. 65% beads will take in and release moisture to keep it at 68%. If you have 70% beads in there, they are trying to do the same thing. It would turn into a battle of epic proportions! If it's one thing you don't want it's the constant fluctuating of humidity in your humidor. You don't want the cigars taking in and releasing moisture constantly.

The solution: don't open the humidor so much.