Right, it should make them harder. But I had several fights where in the first round Lisa would hit with two or three shots from five against a spitter brain. In the second round - after the second spitter brain made itself harder to hit - she hit with four shots (after which the brain was dead.) This may be a fluke, randomness being random - but it feels like it happened a bit too often. This is why I reportes it. (Same char, same weapon, no other changes but the special power)
I checked what the skill actually does, and it doubles the evasion value. The spitter has 15 by default as base value, but I put a cap of 80 because otherwise was too hard to hit. So yes I think that this move is more effective against low-level party members, once you level up and gain more accuracy should have a minor impact
OK, so it was a fluke...
I don't understand, so is the in-game text that is wrong?
No, the psionic "cure" costs 20/40/60 if it succeeds, and 10/20/30 if not. It should cost the same whether it succeeds or not, as the cost represents the effort you put into curing.