How To Reference Input pins to Cells

When you state it's not creating the false path you need, why not? What path shows up that wasn't cut by this?

A path being analyzed tends to have four features, a launch clock, a latch clock, a from node and a to node. The set_false_path has options to filter paths based on these paths. So the first statement above will cut any path where pclk_pin_a is the launch clock and *inst43* matches the latch clock. I believe these types of paths won't show up, and so it's something else you're seeing being analyzed to say it's not doing what you need.