Good luck with that. 
This is a prime example of another reason why the form sucks as it is. The answers are always different from every guy that does an inspection.
I have another great idea…
Lets on the next form just say provide a picture from all four angles whenever possible and let the underwriters then choose whatever they want to call it and let their individual companies make a case by case decision on whether they want to give discounts for it or not.
It does not need to be fair or have a percentage make a difference because something is 10% verses 12 % let the insurance guys look at it and decide on their own what to charge without interference from anyone. If the customers do not like what they do they should then go somewhere else.