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Hi Michael,
I have been planetary imaging since 2002 and can give you some advice.
The jet stream maps are often wrong. Added to this local conditions can and do affect the quality of the seeing. Things like large topographical features such as mountains, cliff faces and the like affect the quality of the seeing of your local area and the influence can be seen for a hundred kilometers. If the prevailing wind is coming from the behind those features the seeing will generally be poor as eddies are caused from the turbulence. Similarly seeing is affected by buildings which discharge heat during the night.
The best place to image the planets is when they are high in the sky, however even then seeing can be poor or average on many nights. This ultimately means one must check every clear night. One night in 20 might provide good to excellent seeing.
Get to know the weather well for your local area. Good seeing can often happen when there is a high pressure located over your site. Keep persisting in your endeavor and you will eventually have a win.
That said this image is not so bad, it still shows detail.
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