19mm is fine for 28mm, 32mm will fit. I've been riding on a 35mm Pasela TG on an old Mavic O4cd rim. Things get weird under hard cornering just like a 2.125 tire on a 22mm rim. You don't get better cornering you simply get more comfort over bumps. It's worth getting wider rims with wider tires 22mm+ is a better choice for 32-35mm tires.