you have some FD going on with, which is the reason blackstone shows your FP and VC dropping and CAT is saying you got water! Classic E85 FD. Also, ethynol does not really effect FP. So you have some good amount of FD. This is a problem I've seen with GT-R's, I don't know why but have my own theories about the factory. What oil filter are you using? It's probably compensating for the FD you see.
I was using OEM filter with Mobile 0w40.
It sound like it can get complicated with build motor, consider you will have a lot of moving parts in the motor that is not OEM. Like my build will have a dry sleeve, with coated CP Piston and rings that is meant for the sleeve. Then aftermarket bearings, cam, valve, spring, retainer. I guess most of those parts might still use material similar to OEM, but unless you know its exact metallurgy, it sounds like it will be hard to tell exactly which part is wearing down.
I can see that CAT knowing the exact metallurgy of its motor is a benefit to its analysis. Same as GE turbine, which has the same metallurgy for the same model. So comparison from sample to sample in the fleet is valid.
You will need a good data base on OEM and aftermarket metallurgy, then plug them into the algorithm to get a baseline for acceptable wear.