Jackhammer -
This will be our third year with the rule in Oregon.
In a coaches clinic three years ago one of the coaches said, "Well that's easy, when in doubt lead with your hands!"
That pretty much sums it up. Thats all there is too it.
If you don't lead with "Open Hands", you may be making yourself suspect for committing a foul!
That being said, Officials need to see the whole play, and not just the aftermath, before ruling the contact to be a foul. If you didn't see it, then you didn't see it.
A simple answer to a HACKED off coach is; "Coach if that's the way it happened, then I missed it!!!" That age old line usually shuts them up as they try to determine what the heck you just said!
And, three plays later when they do they realize it, they think you admitted they were right and you were wrong, (even though that not at all what you said) Try it - It works!