Can't change the minigame, but you can equip chips to improve the results of the hacking. Don't sleep on 9S's moveset either, it's awkward coming from 2B but it's not weak.
Yeah, 9S's Spear Throw (Hold Square) is really powerful since you can use the move quickly, and I find using Blades is more useful with 9S than with 2B. I really like giving him the Hammer Pod Program as well as it pairs well with his Spear Throw. Using Gravity to draw enemies together before Hacking is also very powerful as the aoe explosion and effects can wipe out entire groups in one go. His game is much shorter because you spend less time in combat and boss fights are very different because he just hacks them to death, rather than having to fight them normally, for the most part. You also don't have to replay 2B's entire campaign, as the two playthroughs have a major shift after the battle at the flooded ruins. 9S spends the back half of his campaign doing some very important stuff, since if you remember he and 2B split up for the last several parts of the campaign, and only truly rejoin at the end of the first half of the game.