To answer the original question. Yes, I use the Triton method, which includes ALK, MAG, CAL and Trace elements.
From what I see above, some of your numbers look a bit weird.
For example:
ALK/DKH: 8.1 - 8.3 = Looks a bit low for a tank with SPS corals. I'd shoot for 9 to 10.
CA: 300- 350 = Looks a bit low for a tank with SPS corals. I'd shoot for 450
MG: 1400-1550 = Looks a bit high, but with ALK being lower, the corals will not absorb other elements properly.
Your light is great, flow looks great, You did not share PH, but I can guess that it should be low as well, since the ALK is lower for an SPS tank.
As far as water changes go, most here will recommend a weekly 10% to 15% of volume, which is the correct way to go to replenish all your minerals and elements. If you don't do regular water changes like me, then you will need to implement something like the Triton Method and a large fuge to maintain water clarity.
You can use this as a guide for your levels.