You are most welcome! I know that I was totally delighted when I found out about this, as I also was getting a thin slimy yoghurt that I couldn't make myself eat - lol!
It makes a BIG difference to the consistency when you add the milk powder, but you will still need to experiment with the amount you add (I use lots, as I like a thick yoghurt)
Good luck with your next batch, let me know how you go.