Ladies and Gentleman,
I finally got to try out the whole setup at rehearsal tonight. I'm running the Modulus Q5 into an Eden WT400 and 410XLT (with a little bit of stage volume:9 or 10 o'clock), and a direct out to the board. I am also playing some acoustic guitar and mandolin through a Shure KSM32 for more stripped down tunes. Aviom monitor mixer and Shure E3's with custom molds.
I have only tried the Shure E3's, but when I first tried them a week ago with the standard rubber tips, they were decent at best. Now with the custom molds, the difference is night and day. The low end has improved dramatically, more clarity overall, and way more noise reduction on stage. The low end response is just as good, if not better, than my larger AKG studio headphones. I guess it's something to do with the vibration being transmitted through the skull and jawbone.
I am still planning on trying the E4's, possibly the E5's, but I could do my job well with the E3's, now that I have these custom molds. I have a feeling the exaggerated bass of the E4's will be to my liking, though. I'm not really in a rush to try the E5's, since I would need to have other molds made.
In short, the molds make all the difference in the world.