exporting to youtube--video still jolty

G'morning!

I wonder if anyone has run into the same problem as I have. I'm trying to upload my trailer onto youtube, and i'm using their recommended settings, but the video still looks a little jolty in places. my project is NTSC 4:3, 29.97 fps

here are the settings/directions that youtube recommends and that i tried:
# In the Video section select the following:

* Compression Type: H264
* Frame Rate: 30
* Data Rate: Automatic
(if you choose to restrict the Data Rate, make sure to choose the highest value acceptable to you — more bits means better quality)
* Key Frames: Automatic
* Frame Reording: Unchecked


# In the Video section click Size and set Dimensions to the original size of your video (Note: HD resolutions - 1280x720 or 1920x1080 - preferred).

# Select Prepare for internet Streaming and choose Fast Start from the drop-down menu.

# In the Audio section, make sure that the audio codec is AAC. Always use AAC as the preferred audio codec.

# Once you've made all of these selections, click the OK button to save your preferences.

I followed all of these and tried various versions with "medium" quality instead of "high quality"- still jolty - and 29.97 fps - looked worse than 30.

Any ideas?

Many thanks,
Marisa

I also just used