Curling/Wavy leaves

Hi, I'm completely new to growing, and I have a problem I can't identify. The leaves on 1 (one) of my 3 plants droop pretty badly during the day and "mostly" recover at night (although still a little droopy). The other plants don't do this at all.
I'm lighting 18/6, with about 11 or 12 hrs of the 18 being outside and then 6 or 7 hrs under cfl, then 6 off (going to have to switch to all cfl soon as they are almost too big [10-12"] to remain unnoticed by the neighbors).
Medium is 60% peat, 20% perlite, & 20% vermiculite in 16" pots. I "shake & bake" mixed them in a large plastic bag to make sure they were well mixed. My grow space is well ventilated, humidity and temps are good, and is free of any problems being newly constructed.

As you can see in images 1 & 2 (the same plant), and the leaves are kinda of wavy looking, and feel slightly papery/dry. The other images are my other 2 plants, which look like they're doing OK.
All get same light, food (Technaflora BC Boost, BC Grow, Thrive Alive B-1 RED, MagiCal, Sugar Daddy) in the recommended amounts for vegging, same water etc, but the one looks off. Feed and water 3 day cycle is day 1 feed, day 2 water, day 3 water. This being a "soil-less" setup, I think this is the right cycle. Also, when I water the oddball, a little of the water runs from the drains in the pots, but does not in the others. Again the perlite and vermiculite are well mixed, and in the correct amounts, but it seems I have more run-off from the oddball's pot.
Any suggestions what could be going on with the oddball?
Any help will be greatly appreciated.
Thanks

Did you mix the soil yourself?

If you made the soil yourself from it's individual components, did you add any lime to counter the acidic peat?

looks like heat/light stress. Even with a comfortable room temp, the canopy (leaves) can become very hot. Think of a blacktop on a summer day. They twist and contort to reduce the surface area exposed to the source of the heat. THe folding of the leaves is also an indication of heat stress. The fact that they get better at night also suggests that heat may be the problem.

The difference in intensity between the sun and a few CFL's is drastic. The leaf issues can be a result of the plants trying to adjust to the change in light intensity.

dl290485, I did mix the peat, perlite and vermiculite myself, and I did not add lime as I was not aware I should have. I thought I had done my homework before I mixed my soil, but it seems not enough . . .

MYOB, I wondered if heat stress or too much direct sunlight might be it, but being a newb, had to ask the pros

The other 2 plants seem to love all the light, and don't miss a step when exposed to it all day long, and in fact seem to be thriving on it
Maybe oddball is just a temperamental plant (or slightly brain damaged) . . . and YEAH, I've named it oddball after Donald Sutherland character in Kelly's Hero's, so I'm a nut-job myself . . .
Which brings me to the water drainage from oddball. I use the same amount of water in all the plants, and the oddball is the only one that will not hold what I am giving it. The pots and drain holes are identical, grow media is identical, but that one will not absorb as well as the others which actually seem to be in better condition.
I'm feeding on a 3 day cycle, food day 1, water day 2 and 3 repeat. The pots never get dry and do not loose much weight, but since they are outside so much, I thought they might require a little more than indoor plants considering the heat and breeze drying them out to some extent
So, how WRONG am I?

Ok i'm just guessing here... but you say one pot is always more wet and runs off sooner than the other right? And you mixed the soil? AND it's also the same plant with problems? Maybe it got a bigger share of the peat than the other pots? Which could translate into- stays wetter & possible acidic ph problem.

Just a guess though