Well, I thought I had control of the aphids. I was still spraying regularly for a couple of weeks after the last of them were dead, just in case. I though all was well so I stopped spraying, and they immediately came back, worse than ever. This time, I wasn't taking any chances.
I pulled every plant out of its pot and thoroughly rinsed it off to wash away any aphids and eggs, then soaked each one, roots and all, in a soapy solution for several minutes. Once finished there, I rinsed them in a bucket of fresh water, then repotted them with new soil, which has been frozen a couple of times already, and should not have any live bugs or eggs in it anymore. I removed all plants from my grow area, thoroughly vacuumed it out, and am letting it sit for two weeks with sticky traps before any plants go back in. I am going to keep spraying my plants on a weekly basis until the end of the year, just to make totally, 100% sure these little bastards never come back. If the infestation returns, I might just have to scrap the project completely. Wish me luck!
I also tossed out a few plants that were less desirable. I ditched my douglah plant (it was throwing out red pods anyway) and my Perfume plant, as well as one of the reapers that just wasn't doing as well as the rest. Less plants = less chance of aphids coming back