Back from a couple rounds of testing, so here's my thoughts.
Greased is not good on Hades. It makes the shots harder and doesn't reduce the arming time at all to compensate for the close-range use you'd expect greased to be good for.
Gatling range difference is very noticeable since gatlings were often used at the extent of their range before. Will force people to use standard more for the improved range. If that's the goal then I guess it worked.
Banshee it's hard to say. The travel time difference is noticeable, the tempo change is going to take some getting used to, and it doesn't seem like greased as a primary ammo will be good if the banshee is being used as a primary. As a secondary I think it's in a reasonable spot. The RoF increase makes it so you can empty the clip faster to get back to repairs.
The increased drop for mercury is barely noticeable over heatsink. It exists, but it's only going to do much at very long range.
As for changes in power level, I'd have to pilot 5 more matches to really say. It does seem to make mortar stronger though.
Overall, I think if you got rid of the arming time increase I'd be fine with it. A big part of greased is the's the premier close-range ammo, so I don't think that guns with arming time being more close-ranged should be a huge concern.
Lochnagar is interesting. Didn't get to use it a ton. The increased rotation penalty is very noticeable, guns turn like bricks. Lochnagar gat does not seem super powerful, but that could be just because the RoF feels so different being so low. Makes maintaining the gun's RoF when shooting more manageable.
I tried to pull off loch flak (3 shots) since in theory it could one-clip a pyra. In practice, the user missed a ton. It seems it was very difficult to handle. I'd have to mess with it more to really say more on it.
As a side-note, please allow 1 ship bot deathmatch for practice. Would make it easier to test things.