My hero is using 'Super sexy ninja doctor syringe', which is level 80 and I have newer 'Tough ninja doctor syringe', which is level 81. When switching between these equipment hardcore, charm and know-how stats change as promised but harmony decreases 300 more as expected and endurance increases only 2828 and not 7069 as expected. So the stats shown in the level 81 syringe do not seem to be correct...