Plant Problems/Soil Problems? Help!

I have 2 plants going outdoors they look very healthy, the weather has been in the 70s, with sunlight ranging from 6-13hours a day, rain atleast once a week. They get direct sunlight during these hours. But my problem here is I think I should of prepped my soil? I transplanted them both a week ago straight into the soil.. its a clay medium, i have been adding composted horse manure in a effort to increase nutrients in the soil, but it seems like the plant growth on both of them has slowed down, before i transplanted they were going fast ( were both in a terracotta pot ) with regular miracle gro potting soil. but I figured they were getting to big and would start fighting for root space so i transplanted.. there on there 3rd set of true leaves, and the 4th are starting to pop out a little bit. ANY HELP ON THIS !?!?!??! - also i water everyday because the clay soil seems that its wet, but its not moist underneath you know what i mean? sorry for the paragraph.

Also there planting really close to each other.. but this should be no reason for slowed growth because they show no signs of being unhealthy like they are fighting for root..