Hi all,
I can't say that I know what the matter is, but the jig has dimensions that do not necessarily correlate to the finished product. Say a jig in N scale for a #8 is 7" long. You may or may not cut your stock rails and frog rails so that they only meet the limits of the jig...you may make them longer. These are not manufactured turnouts that have a defined length as Customline ones will. So, my guess, entirely uneducated, is that you will have to set the parameters yourself. Pick a length, ...in fact use Atlas or Kato or whatever as a template, because you always trim the Fast Tracks turnout rails when placing them, anyway. I did.