Slicing is absolutely useless right now. I feared this the moment I picked up slicing and noticed how many credits I was getting proportional to the amount of effort I used in getting said currency.
I have been running slicing missions all day, well over a dozen of max level 50 ones (My character is level 26, I have around 345 slicing) and I have lost money. Half the time you lose money just in general, others your mission just outright fails, and then sometimes you get a profit of not very much unless you get a critical proc.
I realized that it needed a nerf, but not as drastic as this.
Cut the reduction that was implemented in this patch in half, and I think it will be fine. I've seen 50% thrown around, which seems somewhat accurate, so a 25% or 20% reduction would be a good place to start.