If I wanted better stopping, I'd first assume that the pads are slightly contaminated and replace them, and clean the rotors before putting new pads on. My experience is that it's a waste of time to try to clean pads. If they're very recently and very slightly contaminated sanding can help, but otherwise they're pretty porous. Also it's helpful to properly bed the pads in anytime you have new pads, or if you ever resurface the pads or rotors. Basically, the idea is to drag a brake until it's warm, then perform a series of hard braking efforts with it that do not lock the wheel. This will evenly deposit pad material onto the rotor and improve brake performance. I would pretty much overhaul the entire bike before I got to lubing the caliper bearings...
Compressionless housing was probably not stock on the bike but does help a lot. You should have replaced cables and housing on everything by now if you've been riding since 2014.