looking good to me rak, seems like your ppms are a little low for half strength though. Are you using the 3 part gh series? If so and your leaf tips don't show any signs of burn,up your nutes a little more. I used the chart from the second post of this link.
https://www.rollitup.org/hydroponics-aeroponics/200589-reliable-ppm-chart-marijuana.html to find a general idea of where my ppms should be. My girl didn't like a lot of nutes early on so I went with the lower end of the scale but now that she's flowering she's sucking them down. I think your good with the cal mag dosage since no further signs are showing which is great. Hope this helps.
Thanks for the info on the reflectix, found some on amazon for 7 bucks that should provide me enough for my needs.