I measured from rear of saddle to wall and center of BB to wall, then I did the plum line from tip of saddle and cross checked both measurements.
I also placed tape on the frames where the distance from the BB is.
I can easily look at the BB been the balance point I can understand that considering we're rotating our feet around it, it's a pivot point almost.
I'm going to focus on the Kineses for the moment on the assumption that hopefully the Trek is too small for me.