HPL 0W-20 or 5W-20 question

Moving up a grade on my end has to do more with spirited driving behavior and seasonal weather. But also my engine is a naturally high revving one for its displacement size. Its getting very hot here in a couple of weeks where we even get high 70s - 80s Fahrenheit ambient in 5AM in the morning. As for choices, its a hard one, the regular PCMO has an impressive 4.28 HTHS viscosity where as the HDEO Premium and Supercar are in the low border 4 range with higher SAPS. Not sure if they will make a difference but doesn't hurt to have a little extra safety factor.
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This is the PDS of the HPL No VII. I don't understand how the Euro 5W-20 has a HTHS of ~3.27 while the Euro 10W-20 has an HTHS of ~2.8. If we look at the PCMO 0W-20 vs 5W-20, we see their HTHS is almost the same.
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