If you cloned him you’ve just doubled the problem since a cloned tuvix is still Neelix and Tuvok. Even if you split one copy the other is still made of people who deserve to live their own lives.
I’m playing the new difficulty and its great. If you fuck up there is no way back except to your last save. You can’t even quickload. I don’t think it’s more difficult than tactician so far but I’m still in act 1.