I can see your reasoning for keeping that conjunction in the 5th, especially with Venus as the chart ruler for this one. I'm not sure how Saturn in the 7th would work out though. That seems risky. So does the moon's final aspect squaring Uranus in the 12th. At least it's cadent. I think the grand trine between Sun/Moon/Neptune is lovely.
I stumbled upon this book... Don't know anything about it, but thought you might be interested since it's specific for wedding planning:
[URL=http://www.amazon.com/dp/0738711691/ref=as_sl_pd_tf_lc?tag=aprilelliottkent&camp=14573&creative=327641&linkCode=as1&creativeASIN=0738711691&adid=0TKJACQCM0GE4N9CB6DS&&ref-refU RL=ht]http://www.amazon.com/dp/0738711691/ref=as_sl_pd_tf_lc?tag=aprilelliottkent&camp=14573&creative=327641&linkCode=as1&creativeASIN=0738711691&adid=0TKJACQCM0GE4N9CB6DS&&ref-ref URL=ht[/URL] tp%3A%2F%2Fwww.bigskyastrology.com%2Fwedding-date-astrology-tutorial%2Ftime-third-try%2F
Here's also a good link specifically talking about what you want to find in a wedding electional chart:
http://www.mountainastrologer.com/standards/editor%27s%20choice/articles/electional.ht ml
It says this about your Saturn in the 7th:
"Planets in the House that Rules the Matter
Say that someone elects a chart for a wedding, and the chart has Saturn in the 7th house. A lot of astrologers might gasp. That’s an overreaction, I think — but I would like to see this particular Saturn supported by lots of easy aspects and relatively free of hard ones before I breathed easily about it.
The general principle here is that any planet lying in the house of the quesited assumes a great deal of power in the chart. That’s a fairly obvious idea, intuitively. The trick is to be cautious about any knee-jerk assumptions about which planets are good and which ones are bad. We would love to see Jupiter in the 7th house of a wedding chart — but if Jupiter is currently passing through some tense aspects, you probably don’t want to put it in the spotlight. Doing so could suggest unrealistically high expectations of the marriage, which can lead quickly to disillusionment. A solid, happy Saturn might serve your intentions a lot more effectively."
I don't really think you will get much better than the time you have chosen on this day.
A good point of clarity on timing:
"The actual moment that you are pronounced husband and wife or spouses is the time that counts. So when providing me with a time range for this event (explained below), you need to know if your ceremony will take 2 hours or 20 minutes." http://www.beyondsunsigns.com/astroplanning.html
I don't know what kind of ceremony you are planning but anything could happen that day to throw the end timing off... You might want to see how early you can keep that time to plan for unexpected things coming up to delay that important point that counts: "I now pronounce you man and wife." (or similar)
I think with Saturn in the 7th house, there is a possibility of delay for the event...?