happylife- I would agree that you should maybe find a new conditioner. Pantene is known, at least among the "curly community", to be the worst culprit in terms of silicone. It is loaded with them, most having not just dimethicone or amodimethicone, but cyclopentasiloxane, which is the worst cone of all. Strangely, Pantene is very polarizing- people either love it or hate it. I am firmly in the latter camp, as I find that it "coats" my hair, like your stylist pointed out.
I wouldn't bother trying to re-start using a baking soda scrub/vinegar rinse. To get out 'cone buildup, you really need a shampoo with sulfates. I'd say use it once, scrub hard and start over with a cone-free conditioner. Maybe a Suave Naturals would work for you?