I feel like em-1 or labs are the two organic things people would recommend to use in your situation.
I used em-1 once, not sure if it made a difference. If anything I think it may have smelled more with the em-1, since that stuff has a kinda sick-sweet vinegar smell. I'm also thinking like, anaerobic bacteria don't really thrive in aerobic environments, and vice versa...so whatever might be growing down in the res, will it ever actually make it up into the soil where most of your roots and soil food web are...?
You're doing no-till, right? Or at least some kind of succession planting? My current grow is the first one where I'm cutting one plant down and putting another one in, leaving the dead roots in the res. I was contemplating ordering another bottle of em-1, so if you use it please report back how it works for ya.