Issue title: Expose Weakness (Hunter t2 proc) is 10x the actual proc chance
 Issue body: Here is a log of someone attacking essentially a target dummy for 26 minutes:
https://www.warcraftlogs.com/reports/rx31nd7AfgPL6bkz/#fight=last&type=auras&spells=debuffs&hostility=1&ability=23577

You can see the buff only has a 5% uptime; when I sim myself in full t2 it shows a 50% uptime. The proc change just needs divided by ten.
 Comments: 
 Comment 0: Not the biggest of sample sizes, but it is obviously very probable that the proc rate should be reduced a fair bit.
 Comment 1: Fixed with PR #157 
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