I have the Smok reader and the center pin is quite recessed. It won't read one of my atomizers that has a short 510 connector. So, you're not alone. The only thing I can think of, is to get a small piece of copper wire, bend it on an O shape, and lay it on the meter as you screw it in... making sure not to touch the edges.. it's a temporary fix and very finniky. the only other permanent solution requires grinding down the top of the 510 connector down a bit until it makes contact, but that is irreversable. I'm personally looking for a replacement to the Smok, since it reads only out to one decimal place.
If you have one laying around, you could try a 510 to 510 adapter or an airflow adapter.