Using EQMOD, I have 'reverse DEC on pier-side...', UN-checked.
@OP I only bin 2 when using an asi120 on an OAG @ 1200mm focal length where it is important to remove the backlash before calibration DEC. There is an option to bump the mount in DEC before calibration. Must have it set although using a 240mm focal length bin 1 guide telescope, it doesn't really matter.