I've tried many, but have had the most success with the Default. I use a simple dot for aircraft. But when it comes to the Ostie, I just do better with the Default. I do not even "zoom in, move sight up, etc." I've gotten the "leads" down to a science.
The only reason I mention this, is simple. What works for someone else, may not work for you. You'll have to practice and test a few sights, to find out what you are most comfortable with.