I've had my Epipremnum aureum trailing down a shelf for about three years now, and I'm finally getting somewhere with propagation

I've had my Epipremnum aureum trailing down a shelf for about three years now, and I'm finally getting somewhere with propagation. I kept assuming it needed more light, but it turns out the issue was water quality—our tap water's pH was just off enough to slow root development. Since I started using collected rainwater, the cuttings have been rooting in half the time. Anyone else had trouble with this species, or am I overthinking it?