My experience and limited understanding...
As they cure, there is an up and down rh spike effect. Yeah you can get the outside real dry and jar them, then the rh will spike as more moisture migrates out from the center or most dense parts of the bud. Something I've learned to do, is keep it in the refrigerator to get it dryer and cold. Take it out of the fridge and let it reach room temp. Now remove the jar top and it should off gas a good bit. Place top back on jar and back into the fridge and repeat daily until you reach your rh goal. Then I toss in a 62% rh packet (58% are available) and store as typical. But I'll still check on them to make sure they're stable, because you can't undo mold. If I have a large amount, I'll put the bud into a large brown paper sacks and use the fridge crisper for the process. If moisture is still to high, I'll spread it out and let them air dry more. Also over stuffing your jars can hinder the process. You still need air getting to all sides of the bud.