Here's another pic which shows how the switch area is concave and how the mating surface of the grip is flat:
I contacted CT but I'm not thrilled with the answer I received. Basically, they will replace the item but if the replacement comes with the same gap, there's nothing they can do about it. Not at all what I expected to hear from a respected, well-known company.
Hopefully, the right people will get notified and resolve the issue.
What do you folks think? Acceptable or not?