Couple of questions

[MaxWilson]

Yes, so if you have any kind of reinvigoration you'll get extra fatigue from Quickness (you'll gain fatigue twice and lose it once per round). If you don't have reinvigoration you might as well get off all the attacks you're capable of as quickly as possible. Gaining 100 fatigue from 25 attacks over 13 rounds instead of 25 just means there are fewer opportunities to counterattack you.

-Max