Firstly, when it comes to those hook ratings, I think most bowlers will find that two balls on opposite ends of the spectrum (very strong and very week) only hook 5-7 boards more than each other. I don't think I've ever seen anyone buy a weak ball and be forced to play up the gutter, and then get a very strong ball and be forced to play the 5th arrow. Your game will determine how much hook you get, and all balls are going to fall into a pretty finite window.
Basically, your Cell may force you to play 12 at the arrows, while the Eruption may force you to play 9 at the arrows. Not much difference really.
Now, the answer to your question can get kind of tricky.
When changing the surface of the ball you're not really changing how much it hooks, your changing when it hooks.
Taking a ball up in surface (2000 to 4000 for example) or polishing it, will make it hook later. This causes the ball to not hook in the midlane and to save its energy for the backend.
The result of this can cause the ball to hook more. (many bowlers assume polishing it will make it hook less, and usually it does, but its not always the case.)
The ultimate objective is to match the cover up to the conditions you're on. If you're on heavy oil, you want to sand it aggressively. If you're on very light oil, you want to bring the surface up, and polish it.
All of this takes a lot of trial and error, and a lot of really using your eyes. It even takes a long time to really understand exactly what it is you're looking for. Its not just about total hook. Its about getting your ball to do the right thing at the right part of the lane.
Nowadays, I open bowl practice and go to Nationals every year.
USBC Open personal bests: 226/602/1690
USBC Open career average: 174.66 (45 Games)
See you in Reno 2020!