How to learn Poulenc Sonata for Flute and Piano?

Is it okay if I take the 3rd movement much slower than it should be? How do I speed it up? What would you say the goal tempo would be?
Update: I like Gary Schocker's recording the most. My part is marked at 160... I definately am not going to take it this fast. I'll ask my teacher about alternate fingerings...
Update 2: Also, would you say the second movement takes more control than the 3rd?
Update 3: Would you go into the 3rd movement from the 2nd attaca?
Update 4:

I was thinking something like this?
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