How much do I have to enchant a nuke to see a diff

I enchanted my death spike to +1 for power. When I tested it the damage was exactly the same. I guess that means less than 1/2 point of damage increase. Since I am doing well over 1000 points of damage, the increase is less than .05%.

How much do I have to enchant to get an awesome 1% increase?

+1 is exactly the same as +0 for death spike, it increases by a little bit more over the next few levels of enchant.

I think you notice real difference at +3 where the nuke gets +1 power.