I know some applicants write their own rec letters, so were you modest in your own recommendation or did you go all out and say you were Superman?
The other thing is that I'm working closesly with my recommender and he might be saying some stuff that I mentioned in my essays. So it would seem that I wrote my own recommendation.
When schools see the rec letter is written with extreme detail, almost shadowing and supplementing the essays, do they get suspicious?
yes, adcoms know what to look for. however recommender echoing your essay is a good thing IMO.. it would be worse if recom. was diverging from your positioning, just don't use same exact phrases. it's advisable to give your recom. a rough outline of how you will be positioning yourself to each school.
check out "How to get into the top mba programs" by richard montauk, I really like this book as far as advice goes, he touches upon all these topics (he doesn't talk about run-on sentences