Trouble Controlling Humidity in Edgestar

I purcahsed an Edgestar 28 and turned into a humidor by following instructions on other links about hooking it up to a Ranco therm controller, putting in a fan on a timer to circulate the air, and then filling all the holes with silicone.

I purchased humidification 65% humidification beads, and currently have 1 pound or so stored in the mesh bags.

When I check my humidity, its all over the place. I have seen it at 65%, and then 30 minutes later it will be at 50%, and the later up to 70%.

I don't have any of the cedar shelves in yet, just my regular humidor and 2 more boxes of cigars.

I set the Ranco to kick on at 73 and bring the temp down to 70.

Any ideas on why the humidity swing?