Good to hear that it tastes good! About the veins, did you mix the PR through the milk? PR needs air to develop, that's why the rind went blue and why blue cheeses are pierced. Have you pierced the cheese? You can use a sterilized knitting needle for it, just go carefully through the cheese in all directions. Normally it is done when the rind is showing the first blue and it can be repeated after a week, depending on the amount of blue veins you want.
With e.g. Cambozola the PC is mixed through the milk, but when the moulds are filled half, the PR powder is sprinkled over the curds and then the rest of the curds are put on top. When the PC starts to appear on the rind, the cheeses are pierced. This way the rind stays white...