Those weights are within the expected range for New Beats.
The bottom hat is 13 & 7/8", while the top is 14 & 3/16"
The diameters aren't as close as I'd expect to 14" given the manufacturing period. However, just because they are different diameters doesn't automatically account for their poor performance as a pair in my limited experience. I've got some pairings with different diameter tops and bottoms and they work fine. In some cases the differences in diameter are because they are from the Zildjian Trans Stamp period (before sizing became as accurate as it is 1960s onwards) and in other cases it is mixing Italian (made in metric so not quite exact inch sizes) with accurate inch sizes, or modern Turkish or Chinese (which seem to combine metric and inaccurate sizing in different cases). I played lots of mix and max across continents before I settled down with ones I like.
One test now is to put each hat on a flat surface and check that it sits well making contact with the flat surface all the way around. If one or both don't sit flat (we tend to call that "warped") that could be your problem. Did you get any insight into whether they are perfectly round or not based on measuring the diameter from several starting points? Did you nest one in the other to detect any out of round or flat areas around the circumference?
So your bottom hat has the 1st gen ink like this:
[img]http://black.net.nz/cym2014/NewBeatBottom60s.jpg[/img]
and also the hollow Zildjian ink like this:
[img]http://black.net.nz/cym2013/70sA3.jpg[/img]
That's an interesting combination. Does it have a 60s die stamp? Or a 70s?
60s: http://black.net.nz/avedis/avedis-gallery.html#60s
70s: http://black.net.nz/avedis/avedis-gallery.html#70s
And how about the top? What sort of die stamp does it have? You say no markings, but I presume you mean no ink markings. But it does have a Zildjian die stamp of some sort? if it isn't one of a few expected die stamps, then maybe your top cymbal is something else which Zildjian made? Not from the A line? Possibly a second? Or entirely non Zildjian?
I think it's getting to be time for a picture of each hat from the top and the bottom. That might save me using 1,000 words to try and pull out the details I need to be sure what you have there. I'd be looking at lathing, bell shape and size, and that sort of thing which might be a clue.
You do have the option to start looking for an orphan and play "mix and match" to try and find a pairing which give you the sound you seek. But that's a potentially more expensive road than just buying a pair you do like the sound of.