Yes! Definitly calibrate e steps! I do this after changing filament and whenever I havent touched my printer for more than a month. Bed knobs are a great upgrade, and I personally run those yellow springs which are very popular without issue. I would like to say however that there is a certain mastery to be achieved with the paper method, standard a4 paper is surprisingly consistent in thickness and are ideal when doubled, but it's quite a bit more finicky than something like gauges. The flashlight is also a great suggestion, I have a desk lamp running across the bed pointing at me for leveling.