I had mentioned how the default Barrowman CP of the Toypedo was messed up. Apogee Newsletter #238 not only discusses the differences between the Barrowman and RockSim methods but has an example that specifically address the issue at hand (see excerpt below). With a wide body and a relatively skinny (~BT-20) base, the fins are largely occluded inside the tail cone when using Barrowman. It is also clear that, as in version 8, the program HAS to switch modes when you add something that Barrowman can't handle...such as a ring tail. Version 9 just doesn't tell you that it did it.