A few suggestions:
To see if your pedal rig is putting out enough signal, just plug it in w/ a short guitar cable directly to the mixer (no snake, no cables over 25 ft.)
If the signal level is fine then the problem lies in the 'Line Loss' from trying to run it throught the snake / or cables longer than 25'.
If the signal level is still too low, then you'll need a device like a line driver or clean booster to get the signal up.
Impeadance matching is most important when running a long line or though a snake. Your pedals are a HiZ out. So if you want to run it through a snake w/ or w/out a DI, LoZ is the way to run to the board. You can get Hi to Lo Z adapters for both ends. Or just one to convert the pedal(s) output to LoZ and use the XLR LoZ in at the board.