I have been having this exact problem as well. However, I am using a different supplier than Tapi. Although it's possible it's manufactured by the same factory.
Previously, my bartops had an incredibly precise fit. Easy insertion, great consistency. No problems at all for years.
Over the past few years, I started getting a lot of problems. A lot of difficult insertions and once they were in, they were very hard to remove.
I contacted my supplier and they suggested inconsistencies in the glass. I also use Piramal glass, but haven't bought any of the glass made in India yet.
I decided to test this claim that the glass was at fault. On my next bottling run, I separated out all of the too-tight bartops. Then I measured all of them with a digital caliper, and also measured some good bartops.
The difference in the data was clear. The bartops that were too tight were all somewhat larger than the good ones.
I contacted the supplier and they agreed to take the overly large bartops back on credit.
The story continues. I was later discussing this with my Piramal glass supplier. They also distribute the same bartops that I use. They had some very interesting information. They knew all about the problem with inconsistent shank size and said they had heard about it from several customers. Further, they said that the manufacturer was waiting on a specialist from Europe to come to USA and fix their machine.
Hopefully the specialist has long since arrived and the problem is solved. I'll find out when I order again.