I'll toss in my anecdote. From the last time I played on an 80-planet map, the "You Win" screen shows 278 AIP. Of course, I always destroy all data centers whenever convenient, and I destroy the co-processors just before taking the first AI homeworld. I did no hacking at all, saving the hacking progress for the superterminal. Unfortunately I didn't get as much out of the superterminal as I could, aborting relatively early. It still worked out to be a free planet - in fact the net AIP change was maybe -20.
I don't take a planet unless it has a fabricator, ARS, zenith power generator, advanced factory, advanced starship constructor, or superterminal. Naturally, redundant advanced factories/starship constructors are not taken, and the most strategic one is picked. After all that, I'll only take more planets if the shield generator networks force me to, or if an AI homeworld is buried out of the way and I need to take something adjacent just make the assault more accessible. When I have a choice, I go for what will give my planets a good spread throughout the galaxy. My planets are generally spread out and isolated; I don't do chokepoints. I don't know what kind of map you play on, but mine is always "Realistic" and the wormhole layout is usually a galactic spaghetti tangle.
My AIP playstyle is on the low side, but not as ninja/anemic as some other players.