I made a AutoHotKey script to calculate average exp gain per hour base on %, HQ, and base exp per hit.

http://pastebin.com/AftyMijY

As for leves, there are usually 4 types generated randomly. 4 nodes no evaluation, 8 nodes no evaluation, 4 nodes with evaluation, and 8 nodes with evaluation. The best exp per leve is obviously the 8 nodes with evaluation, however those usually require +15% gathering rate to get the max score. The ones with no evaluation usually charges my GP back up to full. I usually do a evaluation leve with a no evaluation so I always have full GP for those evaluation leves.