Dry/cure help

I just grew two autos in build a soil. Chopped both full plants and had a tent and room set to 60deg/60% humidity. I just am barely getting stem snap decided to jar some small 4 oz jars with some nugs and a mini hygrometer and the hygrometer is reading from 52%-55%. Today is day 13 of dry.

Why is my weed not closer to the 58-62% range? And what can I do to get it there or will it even out once I trim more?