Well done PWP ! that is the only way to treat JW's fairly, with respect, and gentle words that may reach their hearts. Looking back over the years it took me to wake up, and finally leave, I realise that it was people who treated me as you treated these ladies, that made me think, and gave me stuff that nagged at me.
A seed planted often takes a while to start to grow, but you never plant such a seed if you attack, or come over as feeling superior to them, the empathetic " I was once like you" is what works.