I think I get where you're coming from...it's nice to have things dialed in and just, well, work for what you're doing...
The M80...I've been around them in studios, but have never actually used one...it's one of the early 8-pre's in a box units, predating the current wave by a dozen years or so. I've never heard anybody trash-talk them, and presonus are generally considered to have good sounding pre's, so they're at least going to be decent if not good.
Try the Roland, if it's at least swinging things in a good direction, might be worth exploring a nicer option...FWIW, one of the mixers I love, that's cheap, small, warm & dirty -- sounds big on drums is the studiomaster XintoY units (8 into 4, 16 into 4, 16 into 8)...they were UK made in the mid '80s and have really nice sounding EQs and direct outs on every channel. Can often pick them up for around $75usd on ebay...well, now that I've written that it'll be $150

. The 8 into 4 rack mounts in 9 spaces so they're good for small setups. Others that fit this sorta bill (inexpensive, unique, big sound, directs) are the Soundcraft 400 and 800 series, Tangent boards.
Just a couple thoughts anyway...