[YouTube-API] yt:quota too many recent calls

I am trying to create a playlist of videos from a spreadsheet.  According to the documentation, I have to make a separate POST request to the playlist for each entry.  Once I hit about 58 entries I start getting the yt:quota "too many recent calls" 403 forbidden error.  I am supplying an X-GData-Key header.

Two questions:

1 - Can I upload multiple videos to a playlist in a single POST operation?  That would be much more efficient.

2 - How can I prevent the rate limit from affecting me?  Isn't X-GData-Key sufficient?

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