My pleasure. It's the old computer programmer coming out in me.
I think you'd make it by 8:15 if you're willing to walk that last part, but I can understand not wanting to feel rushed. As usual, whenever 2 or more modes of transport are involved, it's the uncertainty of the wait times that's the killer.
Drive time Poly to FtW should be around 10-15 minutes, followed by up to 15 minute wait time and a 10 minute bus ride. The Orange bus to the Meadows Trading Post stop will get you closest; you can also take the Yellow bus to the Meadows Recreation Area with a slightly longer walk.