Look outside. See how the bushes leaves flutter and the trees sway every now and then? Thats what you want your garden to do. A single moving fan will be fine, medium speed, blowing at the bottom of the light between the plants to eliminate the light heat at the same time.
Dont worry about painting walls if you have just a handful of plants. A 20 foot piece of white mylar to staple up real fast would only cost you $10-$20 or so which wouldnt be unwise at all, but not necessary.
Move the lights as low as they can without the plants tops being hot. How hot is hot? Hold your hand at the top of the plant. If your hand feels hot, move the lights up. As the plants grow, move the lights proportionately too.
Water the plant in picture #5 less. Its leaves are droopy looking because of that. When you water the plants, picture stuffing the plant your watering into a cup. Then water that much water to that plant when it starts to dry out a bit. Easy as cake.
Good luck.........