I will be listing to the list, my set up is not ideal and will need work hoping to look into this once I get finished work for the Christmas/New year break.
The low passing if definitely the issue with the vocal, trying to place it to catch the SSS but it is having an adverse effect on the overall VOX, kinda a trade off between reducing sibiliance or having a bright vocal. The levels do need to come up a touch.
The same issue for Gtrs I've been low passing quite heavily three groups of those as well. An attempt at separating them out.