Hey Walt,
First off, you are a very trusting person to put your planters that close to the side walk. Here on the mean streets of Simi Valley, those tomatoes wouldn't last for a second. ( I would have stolen them )
I have a SIP that is 8'X3' that I grow vegetables in, and a bunch of tubs for the tomatoes and peppers. Your mix is very near what I use, and no, you can't over water as long as you have over flow holes in the water reservoir placed below the soil level.
I use a mixed bag of ferts, liquid and dry. I'm still working out what works best, but there has been no problems with any of them.
The weather here is at least as hot and dry as yours so I use shade cloth at 30% when the heat is In the 90s or higher. That really seems to make a big difference. Kind of a hassle but worth the effort for me.
This will be my 3rd year in containers, so I'm not an expert, but I have gotten plenty of tomatoes and vegetables and am happy with my results.
Good luck to you,
Marc
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