Hey brother, i have the AC Infinity auto watering bases as well. I have 8 of them. I'm a fan of bottom watering capillary action systems. They work extremely well. Anyways, this is my first grow with them so i am learning their subtleties as i go. Here's what i know from my experience with them so far....
These bases are a pain in the ass to fill from the bottom. You spill a lot of solution on your tent floor and it's annoying. Especially since i have 8 in a 4x4 tent, 9 plats total. (1 is not in a auto water base) They come in 4 packs and i got 2, so i have 8 but i had 9 plats....blah blah.
Anyways, the say in their literature that they will not work unless you have roots coming out the bottom of your fabric pots. The roots weave themselves into the wick rope and the connection is established and then they will work. But without a root mass connecting with the wick rope, it's a hit and miss situation. Some will wick through the fabric and into the soil, and some won't make that connection. But in any situation, you will need to top water the first time and wet your soil completely. If the soil at the bottom of the pot is wet, and the fabric is moist, when the water moves through the wick it will contact the moist bottom of the fabric pot and the connection is established and it will work. If the connection doesn't take effect (which sometimes it won't) you'll come in and find your float level reading full, yet your pot is light and in need of water.
So here's what i do, i say fuck filling the bases with solution. Top water your plants. Let the runoff go into the base and then have the wick suck it up. I know they say not to do that but i don't think it's a big deal unless you are far along your grow and have some salt build up that runs off into your base. Then your gonna have an imbalance of hot nutrients that can burn your stuff and throw your pH out of wack.
Check occasionally for roots growing out the bottoms of your pots. When you see that, then you can start to attempt bottom watering with capillary action (wicking). Be warned though, when you lift and move your pots you can screw up the wick ropes so they are not aligned properly. Also, if you lift your pots to check for roots and the roots have grown out and wrapped themselves in your wick ropes, you're gonna pull those ropes out of the base and then you'll have to rip them away from the roots and re-position them in the base, so be fore warned.
I hope this helps you out.