The OP is running the carb on an NHRA stock eliminator car.
The factory low speed calibration is totally out to lunch for that application.

The rules dictate the correct carb has to be used, and that fuel metering mods are legal(but not the addition of 4 corner idle).

Like I said previously......if I were doing it, it would get a set of new std performance style metering blocks, and then I’d do the same types of mods to the main body/baseplate that were done in that link.

There is no need to try and work on “part throttle cruise” in this application.
It needs to start well, idle decent in gear, do a burnout okay, and have decent manners when staging........along with providing a good fuel curve at WOT.

I’m pretty sure the main issues the OP is having are related to how the motor runs when in other than WOT operation.
Which after seeing how they’re calibrated...... makes perfect sense.