I just changed my e-steps from the default 93 to 96.88 as it was under extruding by 4mm in every100mm - I saved and powered off/on the Ender 3 for good measure. Went back into to e-steps settings to confirm change had saved, extruded another 100mm and the new e-steps setting has made no difference at all. For a test I reverted back to old 1.1 Marling firmware did the exact same and it worked perfectly. Something is wrong here with the firmware build???