Not addressing your point exactly ken but the following has worked well for me over time........
I have 084/072 and 072/054 curved/curved turnouts that Frank Curtis custom made for me many years ago. I use them for entrance/exit to the Service Yard off the 084 and 072 curves of my inner mainline[the turnouts are recycled from former large layouts now gone]. The entrance/exit turnouts are located diagonally across the layout from one another. One of the curved units is seen below where it enters the Yard just to the right of the enginehouse and further below to the left of the House..
I use a 20"[80'] car and 8-drivered Mikado to test negotiation of all of my turnouts.
On a small 9x16 round-the-wall layout such as mine, where I retained wide end-curve arcs, the curved turnouts enable full use of the length of the inner track system space for a Service Yard on one side and a Village on the other side of the layout. The outer mainline curve is 096 with 096 turnouts to Spurs servicing the corners[originally open triangular space but now a Denin Mill in one and Sawmill the other..