I'm so happy to report progress. I have seedlings popping up after only a few days. 4 rows out of 9 in the terracotta pots have seedlings., and lots of seedlings in the small cells. Also in the trays that had spotty germination I added seeds to all the empty cells, and lots of those have new seedlings.
I think my problem was more heat related than soil, or water. The reason I think this is because although I did sow seeds in 6 of the trays with seed starting mix only, 6 more were the mix I used before (I ran out of seed mix) I used new soil in the cells that didn't germinate, but it was the mix I had been using. I have been more careful with watering, so that may contribute, but since it was lack of germination, and not dampening off, I don't think it was all a watering issue.
I'm very annoyed with myself. I know I need to use shade cloth in the fall. I started out using my cover that I covered in row cover to keep the Harlequin bugs out. When I wasn't getting any seedlings, I stopped using it thinking maybe it wasn't letting enough light through, or not enough airflow. I should have put the shade cloth on at that time, but I didn't. My guess is it was just to hot for my cool weather veggies. I could be wrong, but nothing else really adds up. I bought a little solar fan (it was what I could afford) Maybe next year with shade cloth and the fan I can get a more successful earlier start.
Most important is if nothing else goes wrong I should have lots of veggies, flowers, and herbs to plant.