Were you running C42 tier 2 or tier 3?
Are you taking advantage of the oil immunity bug?
These would be helpful to know.
It would also be helpful if you changed the title, to "C42 feedback round 2" or something of sorts, since some people might confuse this with pre-nerf and just assume you were abusing oil immunity or something.
Wether you found this mission truly easy or truly difficult, it is hard to tell without the above information given.