Thanks for all the replies - I have been researching this for a long time...
What's strange is that through my headphones, everything sounds phenomenal. As soon as I plug into our PA, the sound is thin and brittle. I need to remove so much high end information on my guitar channel in the console, even though I run a high cut block after the cabs in my presets. The brittle sound translates from the console to my in ears, but they don't sound as bad when plugged directly into the phones out on the Helix.