Having had similar problems on my first build, I now understand that I should observe humidity and only glue up when humidity is low. I now have hygrometers in my workshop and have noticed that humidity can change quite rapidly and dramatically. I can only imagine the wood stored in the workshop, doesn't respond in the same fashion and it's moisture content is more constant. So , how long does the wood take to reflect the relative humidity? In other words, if the relative humidity shows a constant low, over a couple of days for example, am I right to the think that the wood has dried out enough over that period to reflect the RH shown on the hygrometer, and consequently it is safe to glue up?