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There are two ways to get better zombies:
1. Sacrifice certain corpses if they have a really good heart / brain / intestine (requires Cultist tech upgrade or access to the Soul Chamber). Save the good quality organs until you've got one of each and use them to replace crappy ones in your zombie candidates. This is key in the early game - not every body is worth zombifying or burying. Some are just a source of spare parts to improve other bodies and should be burnt afterwards to provide ash for alchemy or making columbariums.
2. If you have the Better Save Soul DLC, then use the Soul Chamber (the room to the right of your morgue) to modify body parts so they have 3 white skulls.
Your math is correct, btw. :P
Now, no corpse rolls with 9 white skulls, so as Loki mentions, you would need to use the 'good' IPs from multiple corpses and combine them all into one. This is relatively easy to do with a late-game perk known as 'Cultist', but it isn't necessarily required. I would build multiple storage racks in the morgue (at least 3 just for IPs), and sort the IPs you extract there'in. Just keep track of the corpse quality prior to removing an IP and then after you remove the IP, and you can figure approximately what that IP's quality does.
Also, be very afraid of "Surgeon Mistakes" - these are permanent penalties to a corpse, which have a detrimental impact on the efficiency of a zombie. It won't make a zombie 'useless', just not ideal and will guarantee it's imperfection.