Solvent points to fermentation issues- S-04 is a finicky bastard- I'd really try to keep it cool while fermenting. With that high of an FG, 18% crystal + 15% "character malts," and all those ingredients I'm surprised you got dinged for lack of malt character. I can't see any changes *I* would make without grossly changing the character of this beer. Maybe try a different yeast like WLP005 or WLP006.
Maybe swap the pale 2-row for a higher kilned pale malt like Maris Otter?
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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