Suggested grinders for espresso

Since buying my Gaggia Classic earlier this year, I have purchased three manual grinders, but they all share the same issue: the grind settings are either too fine or too coarse. For example, my latest grinder is the Chestnut C3s Pro. It has a wide range of steps, but even at step 8, the first setting where water flows through, it flows too quickly. At step 7, it does not flow at all.

Can someone recommend grinders with more granular grind settings?

This is becoming an expensive hobby.

Note: I'm typically using 19g of coffee, if that is relevant.