I'm late in seeing this post, but had to add my .02, I learned early on when hand holding 4011's the difference 1' can make. Try this, the next time you're at a show listen to the difference simply by squatting down to allow your ears to be at shoulder level and take in the sound there for a minute and then stand up fully or on your tip toes to where your mics would be if on a hat and listen to the music from there. It will make a believer out of you real quick! When I first started taping, in an effort to be "more" stealth I hand held at shoulder height and was sorely disappointed with the outcome and recycled my tapes, as they lacked clarity and dynamic range -- muffled, decreased highs etc.
I have to say that to me it was worth the risk, flying 'em high and getting a tape I knew I would listen to vs. playing it safe and have a tape I would never listen to. PM me for the stories of the ones that got away!!