Sounds like you need to alter the offset between the hotend and the bed.. if you look in the marlin config file for "#define Z_PROBE_OFFSET_FROM_EXTRUDER"

You can also use gcode to set it "M206 Z5" would add 5mm to the offset (you can also use negative numbers) once set issue a M500 to store in EPROM you don't have to set it every time you turn the printer off