I have placed the high value on Zone VIII since the late eighties with very good success. I never could get a handle on exposing for the shadows and developing for the high lights. By exposing for the high lights the shadows fall where they will in relation to the high values, and if there is a need to tweek I have better luck dodging a shadow than burning a high light. I ocassionally will meter my hand at Zone VI, I am caucasion, and use that if there is no usable high light. You might try that instead if you are more comfortable with it. I have found that even in as rigid a format at the "Zone System" there are any number of variables (time of day, time of year, cloud cover or lack there of etc.)that can be employed to arrive at the exposure I feel will yield the best negative of the subject. I hope these thoughts are of use.