I think at -2.7 in the upper tree it would hit the dash ???
One thing I think is being overlooked is just because it works out with math doesn't mean it's always going to ride the best. The opposite is also true, there are configurations out there that mathmatically don't work well but in reality ride great.
Just my 2 cents!
The way I see it is simple. If a shop like Native Custom Baggers says it works, then it works... You haven't heard them say trike trees are the best option...