Nicely done. I think your pH is probably fine. 8.4 is a little high, but I would not be too concerned by it.
Glad to see you are also using a Reef Angel. I am going to steal your thunderstorm code to use when/if I ever put LEDs on my tank.
Yeah, after doing some research it is a touch high, but I think it is fine as well. This is most likely caused by my kalk drip.
I love my reefangel. If you have any questions I might be able to help you out.