So some weeks ago I had installed the Napa TEM 208312 drier without vacuum testing and bolted the front clam back on (I need to road test transmission).
Only today did I get to vacuum testing the A/C. NOTE TO SELF: vacuum test before re-instlaling clam.
I was might worried I had overlooked the Napa unit's ill fitment and that I would get a leak given this post.
The vacuum held great.
So for me, the Napa unit, ordered November 2017, worked fine.
So perhaps the OP's Napa unit was mislabeled or something.
P.S. On a sunny, 72 degree day, I was getting 48 F from the vents, after filing with the 134a.
'07 Lotus Exige S - Chili Red