[markem]

What a cool question. A real stumper for me.
If the cigars have all been in your humi for a while, which I take to mean at least a month, then they should all be around the same RH. But note that most vendors ship with a higher RH than a local roller might use.

To me, it seems like the local source is rolling a little bit more on the loose side. Also, as has been pointed out, getting a Nub to draw tight seems to point to high RH.

I would try dry boxing a couple of the high end sticks and see what happens.

One of the best draw tools for you might be a straightened paper clip.