I am not 100% positive on this but I believe that it will take a tweak inside the engine to raise the ops losses.
Having tested the theory that durability should help - and having it turn out not to do so - causes me to agree. However, changing durability DID have two positive effects:
1) It increased the too low AAA attrition rate;
2) It caused RELATIVE attrition of all sorts (air air combat, AAA and operational) to be more correct between planes of different types. You no longer have the submarine observation floatplane rated higher than much bigger planes, stuff like that. As a result, it is much more likely to be lost to any cause.