my experience playing scum in normals tells me otherwise but i would agree that overall the original setup is definitely way too scumsided and that making it a masonry is Good
if the town is a doc + 3 masons, and mafia has an informed that knows about the existence of a town doc, one idea could be to give scum a combined traffic analyst + vanilla cop, maybe? in mastina's solution, there is a chance that the scumteam could think that the TA is pointless, here i don't think that's the case.
(also, my inner "screw the town" voice is telling me that the doc should have the indecisive or roaming modifier, but realistically i don't think it's really necessary.)