Just a quick point. There are 50 touring acts using the Heils now representing all types of genre, from Joan Baez to the Eagles. There aren't any complaints about wash, or if there are I have not heard about them yet. I wonder what they're using as a formula for success..... Guess I'll have to find out tonight.
My first thought, having tested most of the mics mentioned against the Heils, proved to me the Heils are more sensitive, more articulate, and have a much wider frequency response than the mics mentioned. You're definitely going to hear sound you have not heard in the past.
Have you thought to stop and ask yourself why the GBF of the Heils is greater than other mics, then looked at how much hotter the input of the Heils can get vs. the input of those other mics? Increase the sensitivity and you hear more surrounding sound. Decrease the channel strip gain just a bit, to where the other mics start to feed back, and most the wash goes away. You can then increase the channel output and still outperform the other mics.