Z axis torque increase

Hi all,

I have built a 300 X 300 X 300 machine,

I am currently having an issue where the lead screws are unable to lift the bed up.

I am using two 8 mm lead screws and have increased the current as well.

I would like to know if decreasing the default max speed value in marlin will provide more torque to the motors for lifting the bed. ??

For homing moves moves what values of speed are taken ??

Thanks for your help !

lower acceleration, lower feed rate and decrease the micro-stepping also consider a higher voltage to your stepper motors