Here's a picture of my setup. I've added cages since the picture was taken but as you can see the plants look very healthy in this picture and grew very fast to get this large. Since then they've slowed.

Here is a link that might be useful: {{gwi:405768}}

The leaf curl is probably environmental stress. Definitely sounds like too much watering and possibly nitrogen deficiency. It can be difficult to gauge the right amount of water when using containers but the top couple inches should kinda dry out between waterings and the soil should not be kept saturated. There is a container gardening forum which you should check out as well. They were also started VERY late. Tomatoes here are usually started from seed in the beginning of January and transplanted out mid February through early March.

I'm wondering if the manure was not aged enough and has burned the roots. Cow and horse manure needs to be well aged or it's too 'hot'. In which case I think flushing well might be in order. Sounds like they were okay until the fertilizer application.

watering was touched on ... I'll add a little more:

only water IF in the MORNING the tomato plants are droopy, then only water to soak and let them be ... you should see an improvement by that evening

Thanks for the responses all. I'm going to try and narrow down the problems starting with watering. I'm now only watering once the soil is close to drying and the leaves look droopy in the morning. (also only going to water in the early morning).

2 of the plants do look a lot better. Still a little yellowing on the lower leaves but they seem to be growing well and the leaf curl isn't too bad anymore.

If it doesn't get any better I'll try a different fertilizer and see if i can get a different compost blend to use in my compost tea.

You may want to look at this link:

http://ag.arizona.edu/pubs/garden/mg/pathology/tomato.html