I have 6 so far with the same LM. and silence from 20 schools. I had only 2 II all of last cycle. For me, the biggest improvement was really working hard on crafting my essays. I worked on them all alone and did not have anyone proof read them or anything. I really found reasons why I would be a good fit for X school, and made sure it was not generic and it was completely unique. For schools where I really found good reasons, I got interviews. For schools where I really could not find a great reason to be at that school except to just add another school to my list, I got rejected. I could actually predict very accurately where I was going to get II's and where I was going to gets R's (n~10) just based on how convincing I thought I was with my essays. That for me really has made all the difference. And for reference, I don't have much unique about me.. I think I'm a pretty generic med school applicant.