Divide 80.5 (step/mm) by 76 (distance extruded)
Multiply result by 100 (distance required)
So Esteps/mm wants to be 106. or 105.92. Try that number and repeat to double check/ fine tune
It is easier and quicker to do this calibration without the hotend attached and just wind out the filament into free air.
Your stepper is a YH42BYGH47-401A Nema_17_Stepping_Motor
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