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Post an interesting snapshot of what you are working on. Wether you are a pro photographer, or taking snaps on your phone, it does not matter - we love watch movements and we want to see them and talk about them.
The date should change! I agree it's odd you have two of the same movements exhibiting the same behaviour but one of the reasons I'm replying is that I'm working on an AS 2063 based watch where both the watch and a spare 2063 have the same problem of the quickset not working! Maybe this AS series has some inherent fragility around the date change mech in general?
Anyway it looks like you have little choice but to tackle the dial side and investigate the mech. This is a useful photo ... https://watchguy.co.uk/cgi-bin/media?image=P1030810.JPG&email=&wat_id=2180 ... and you'll primarily need to monitor the operation of the date change device (bottom left in the photo) to check it is pushing the date forward.
what was bothering me in the back of my mind is I worked on a ball watch and there were some differences and I just can't remember what they were? then before you remove the mainspring did it seem like there was additional space in the barrel for something wider? It's unlikely that they made a custom mainspring for the watch so it would have to be one of the Hamilton mainsprings. so I'm giving you the complete Hamilton 16 size section so you can see what once was available and what is currently available hopefully.