Ah, I was starting to wonder if my description made it sound like I was essentially planting directly into plastic. To (hopefully) be more clear, here is what it looks like at the bottom of the pot with the water, bricks for elevation, and sponge wick. My much happier LSU Purple is modeling the gap of at least one inch all the way around. There's good airflow and the temperature does not seem elevated using the plastic. I really think of it more as a self-watering reservoir and I was actually hoping the white would help reflect some of the heat.
All that being said, I realized my sponge wicks are not up to snuff as I was taking these pictures! So, I will be abandoning this specific system for now until I find a better wicking method, though I'm not sure I really need it. I don't have enough plastic pots for all the figs anyway and the ones sitting out have been fine.
Last picture is of a few of them sitting out. In case anyone is wondering, the little guy up front is a cutting I rooted last month and is in a one-gallon fabric pot. Second from the left in the back is a Panache from Hirt's I got June 15 (5 weeks ago) and the rest are all tissue culture from Wellspring Gardens that I got June 2 (7 weeks ago). It's hard to compare a TC with rooted cuttings, but they were more or less comparable in size. The TC now appear 4-5 times bigger than when they started whereas the cutting from Hirt's has grown just a few leaves, maybe doubling in size at most. I know I was wondering how the TC would do before I got them, so just sharing my experience with them. Oh, also, they are all in 5-gallon pots that I didn't fill up all the way thinking it would be plenty of room for growth, but now I wish I'd filled them up.
joann1536: thanks for the reassurance! Glad yours are showing new growth. My LMF is now hiding away close by the house until it hopefully recovers.
Thanks for the welcome sobelri :)