
In addition to the one making the stills heavier, make them higher risk and reward. A few things could really make the process more interesting.
NOTE: I’m not familiar with the prosess, so sorry if this is ignorant of some things.
Lower the time to produce the mash/shine.
Raise the yield.
Make them cost/weigh more.
Raise the price bottles sell for by a bit.
Make them HAVE to be maintained during the process, so they have to be watched. And if not, they can explode, hurting people nearby and making it a large loss.
This gives the gangs somethign to actually do, while giving them some more money. I think it could make for some cool scenes of law, finding a full group of 6 out watching over their shine, with one of them being specialized in making it and taking care of it. The tense situations that could lead to could be great.

Howdy!
I believe Laoh is or will be working on the crim update soon, which might include some changes to the way the stills opperate :D