Your description sounds more like DWC than aeroponics which is good if you're using Technaflora. In my experience that stuff is a bit clog-prone in aero. (mentioning water level below the basket sounds like DWC) The fogger would qualify as aeroponics if that's all you're using.

But as far as ppm goes, that's really strain-specific and influence by growing environment. The more light, CO2 and the hardier the strain, the more you'll want to feed it. Bigger plants eat more too.

Keep an eye on your pumps and drip nozzles and make sure you've got a good filter on your pump intake. Technaflora likes to gum up that stuff and clog it. I'd recommend something cleaner like what Advanced Nutrients makes if you want to steer clear of those problems.