Fillet Edge to a flat ending

I am trying to figure out a way to consistently fillet edges of the type shown here, where the edge ends flat. I have a number of these and they are hit and miss. The top edge I did 2" with rolling ball and no problem. The bottom edge, though similar, will not work.

Problem FIllet (109.6 KB)

Hello - when in doubt, make cleaner surfaces first, then FilletSrf helps in many cases that are tricky for the edge filleting -