Monkey
I really use XJO now, but 20 years ago there was no XJO so I regard XAO as XJO back then. Doesn't matter much.
Yes I use XJO adjusted close (4:15/20 or whenever) and I use the 4:30 SPI close. Using CMC is a bit of a problem because it varies so much from SPI during bull and bear phases. Try FutureSource for delayed SPI quotes perhaps. You could try something with CMC but without a long history to study it would make it difficult.
I use ((SPI-XJO)/XJO)*100 to produce a percentage rather than absolute prem/disc but suit yourself. I didn't always but it does give a better sense of proportion I think.
I did joke the other day about a 160 pt premium and although it would have me selling the family home and using the proceeds as a short, I don't think that likely but you never know.
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