There is interesting videos from DL2MAN (one of developers of uSDX).
For me, I the selected 3 primary and 24 total and 150pF from Owen Duffy’s posts for FT-82-43. The same winding is used by QRPGuys EFHW kits (which important for me, because this is commercial product).
I was able to tune to 1:1.1 SWR with such winding. With 3 primary and 21 total it was about 1.5.
But also, it is important a length of the counterpoise (feeding coax line before common mode choke).