Now, this is very interesting indeed! I have never seen a thimble like that one either, and I collect them! Huh....
It is hard to get used to using a thimble, but, once you do, it is a finger savor. Just keep trying different ones until it does feel right.
It depends on the project what needle I use to sew with. I think what you are using is a between. The nice thing about those is you can get great control of your stitches.