Good job, they look nice! What probably happened is that your molds may have been listed by oil weight, not total batch weight. Also, most of us lose at least some batter to the bowl, the spatula, the stick-blender, etc. You don't notice it much for bigger batches, but for small ones, it can make a difference. Anyway, you can bump up the batch size next time and see how it goes.
For future, you don't need to worry about matching the lye temp exactly to the oil temp. If your lye is a lot cooler than your oils, it can sometimes cause false trace; that where it looks like the batter has emulsified or traced, but it is really just the fats clumping up because they got cold. But other than that, no need to be too concerned about matching temps.
I also have a hard time with plastic wrap making wrinkles on the top of my soap. Plus, I hate things that cost me money over and over again. I've started using the thin cutting mats from the Dollar Store to cover my soap molds. They don't make wrinkles; I can turn the molds over on the mats to take the soaps out; and then I can wash the mats and put them away for next time.