My very rough number (I've only done a little review of the last COP) is similar to yours - low 8s, plus artistry.
This routine is a great example of one of my biggest gripes with the modern COP. I think a casual follower of the sport - even someone who enjoys watching more often than the Olympics, but not into it enough to learn every rule - would have a hard time understanding this routine as a 7.5 E score.
I've watched gymnastics for a very long time, and I struggle accepting it at 7.5, and maybe even an 8. That's not meant as a desire to return to the days of all the hit routines being between 9.862 and 9.999825. But deductions have become so nitpicky, that we now have not awful routines down in the 7s, and it's amazing to break an 8. I'm not sure that's any better for the sport than scores bunched at the top of the scale or NCAA 10s are.
The .1/.3/.5 scale of deductions is a factor in lower scores, but we've been living with that for almost 20 years now, and and I feel like deductions are becoming harsher and harsher. Bringing back the .05 deduction has always been one of my greatest wishes for the post-10 COP. It would probably pull up the scores of well-executed routines by a few tenths, and help better separate a the outstanding routines from the good routines.
I'll save my rant on the current artistry deductions for another post.