On second thought....After shooting eight of the ten rolls I had it was clear only my old Rolleicord was having the problem, not the Yashica or Richoflex. A further web search found someone who said the problem is caused by not having enough tension in the film. I don't really see the connection but it was easy to bend the little tension tab harder against the supply reel to increase film tension. I shot another roll thus with the Rolleicord and, bingo!, no more print through. Don't understand it but it worked. Try it.

Jimski