Page size actually looks fine. You can manually change it to min16-max16GB, but it probably won't matter.
You can try playing with task manager on another computer and checking for spikes and seeing what's causing it. If it's system, might actually be the page size. Or power saving/management, check for those in case (disable any, use full power).
Also, dunno if this is relevant:
http://www.tomshardware.com/forum/311914-28-2600k-random-uasge-increments-idling