'Old' issue with the 'new' AF routine

Hello,
I tested binning 1x1 and longer exposure time and the result seems to be better, not perfect but better.
With my setup, definitively 3 to 4 sec exposure is enough as it produces good signal (saturated and unsaturated stars), increasing the exposure time do not improve the star detection (more saturated stars but always false 'big stars' ), low background level (black night or filter) do not change that.
The AF woks but, in my humble opinion, can be improved by eliminating these multiple stars detection (false high HFR stars), may be filtering by maximal star size in order to take in account only a more or less narrow star size class.
Thank you