I don't think there is any minerals in there but ill double check. I'm pretty sure the only reason they put the nature 2 in is for the month before the salt goes in. Kind of a waste of money but I didn't know what I know now when we started the build.It is much better to use muriatic acid.
Did you have your TA set in PoolMath as that impacts the pH calculation.
Also I see a dreaded Nature 2 in your pictures. We do NOT recommend adding minerals/metals to your pool as you could stain your new plaster and turn your hair green. I highly recommend you remove the minerals from the canister.
Pool math tells me that with a TA of 160ppm, 9lbs should have taken me to like a 7.4, but it's still off the charts at a 8.5+.
I'll switch to MA after I use up this last dry acid.