Let's see a number of thoughts and comments. First a disclaimer I am a bass player first, sound person second. If I haven't said it lately I love the DL. Sure I've looked at the X32 but only because it can be racked up but I haven't gone any further than catalog shopping.
I use the O ring trick and it helps a ton, my gains never move now unless I tell them to
As for gain settings, I find I need to run mine a bit hot if you will as the DL doesn't seem to put out as hot a signal to my amps as I'm used to. One time my foh person was at a small gig that we did on our own. I handed him my ipad and asked if he would do the levels for me. After a song he walked over and turned a lot of my gains down and I noticed the fronts dropped terribly as did my IEM. I think he mistook the occasional red line as a note that the gains were to hot.
Anyway just my thoughts and experiences.
All the best to this mixer.
CP