As far as I understand:
-Growth depends from approval. City with approval of 60% will grow 20% faster then city with approval of 50%
-If approval is above 75%, add extra 25% growth
-If approval is 100%, add extra 100% growth!!!

So what can I see, is that if you plan to pump your economy with growth, you need to lower taxes as low as needed to get 100% aproval, since 100% compared to 99% doubles city growth.

So lower taxes, add entertainment centers, research morale techs, add moral resources and use Neutral path if needed, and gradually increase taxes, while still keeping 100% approval.

When city gets to maxiumum growth, decide do you want it to grow more with farms, or not.
Note that in case you go with farming, you'll probably need at least one more entretainment building too.

If you don't want it to grow anymore, you could raise taxes so it doesn't have 100% approval anymore (as long as other cities that still grow have 100%), or you could destroy some of those approval buildings.

This strategy works best for races optimized with approval, growth and economy bonuses.

P.S.
Personally, I don't like double growth at 100% approval rule, since it adds lots of micromanagemnet, while giving one very powerful strategy, at least in my oppinion. I mean, 100% city already had more then double growth compared to 50% city, does it really need to be doubled once more.