I think that a good idea would be to somehow drop the spy loss % as a target gets more and more spied out.

i just dont think that you should lose the same ammount of spies if you fail a normal op as you do that same op with the guy fully spied out.

I'm not sure why the spy DR is so different from the normal DR as is. It's only for harmful ops, so if there is a change, why not just decrease the damage done rather than the success rate. Then it won't matter if you lose the same spies as you would without DR.