That is a nice dark clone of St. Swithin that you have there! It is definitely a keeper. If one parent was a nice, darker form of rothschildianum and the other parent was a dark philippinense, or Paphiopedilum philippinense var. roebelinii, then that could account for the darker then normal color.
Do you really want the petals to twist? Twisting really is not dominant in the genes of either parent. I prefer the straighter petals myself when judging these. Personally what we look for as judges is a stronger petal stance. The wider the petals near their point of attachment or base, the better they score and the better the flower looks. Otherwise, they start to twist a bit and their overall confirmation or form suffers.