You're too speedy SilentShadow, was just editing the notes to cover that. The N/4 is rounded down. So anything that costs less than 4 would only be increased by 2, anything between 4-7 by 3, from 8-11 by 4, etc.
Oh and I forgot a change:
Change 4: Dampener cost decreased to 4, Suppressor increased to 5.
Reason: The strength of the abilities between the two changed, so I wanted the cost to represent that.