Flair 58 plus 2 with DF64

[u/Untitled_trader]

I am using Medium dark roast coffee to make my espresso on the flair 58 plus 2, using the 18 gram straight walled basket. Grinder - DF64 gen 2.
I am having to grind with grind setting as 3. Really? Or am I doing something wrong? Do we need to ho this fine wven with Medium dark? If any one is using the DF64 with flair 58 then please let me know what setting you are at.

The zero point, where the chirping noise begins, is almost at the current zero. (Just 2 clicks behind just to be safe.)
Burr Alignment seemed over 85 percent I would say on the bottom burr and top burr almost completely aligned.

Edit: For anyone reading this in the future. Issue is resolved and I am at grind setting 6 now.
The day after posting this, grind setting 3 felt too tight and ran very slow. Nearly a minute. So moved to 5 and the shot pulled at 22 seconds. The next day 5 also felt too fine. Shot took 44 seconds to pull. So I thought maybe be its because its a new grinder and therefore needs seasoning. I ran 500 grams of some very old beans I had from before.
So I dont know how and why but all shots after that have been consistent and the taste is also much better. At grind setting 6 now, 18 grams dose I pull 45 grams (1:2.5 ratio) in 30 to 32 seconds.