Well the Ca and Mg is more or less to obtain the SN Plus since calcium is supposed to help with LSPI. Why too much? What would you have replaced it with? If you want to see a lot of Calcium, I posted a VOA of Total Quartz 9000 that was really nothing but calcium at ~2300 PPM if I remember correctly.
Interestingly the PDS puts the 100c KV at 12.8cSt so this is a bit low
. Could be a Blackstone thing..PDS
Also, calcium is actually an antagonist to lspi and most SN+ formulas have Ca closer to 1k ppm or even lower with Mag levels being increased, so that too is interesting to see it at 1400+ ppm. However the addition of moly and differences in base oils and base oil viscosities has been shown to also mitigate lspi events. So maybe there's something going on with that in this lube.
From Chevron Oronite..
"Additive effects on the frequency of LSPI in the Ford test. The "High Ca" oil has a calcium concentration typical of those in the market today. The "Low Ca" has been reformulated to resist LSPI, and is representative of how many next generation oils will behave."https://www.oronite.com/about/news/low-speed-pre-ignition.aspx