You can make Fives hit relatively hard, but his main strength is how often he hits with his high counter chance. I'd suggest going for health and defence mods for him, so that it takes a long time for him to go down. If your enemies take two of three shots to bring him down, you're not going to get much use out of his counter chance and bonus counter damage.
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Critical damage mods: increase damage on critical hits
I hope that helps to make a difference on Barriss ........
What about fives, can I make him hit harder
You can make Fives hit relatively hard, but his main strength is how often he hits with his high counter chance. I'd suggest going for health and defence mods for him, so that it takes a long time for him to go down. If your enemies take two of three shots to bring him down, you're not going to get much use out of his counter chance and bonus counter damage.