That's right, there isn't anything he really abuses with Pit. I'm sure everything you're trying to do with Pit is for the greater good of the character. However, I'm not having many problems with Pit, except the Up-smash change. I know it's an okay change for you, but when I'm playing him against others, and I'd Up-smash at low%. They would get barely launched, and they would be so close, they would be able to punish you right after it, despite them being hit. Not to mention it's even worse when you include SDI into the mix, it's kind of like Pit's F-Smash in Brawl, where you can SDI the first hit and completely dodge the second hit of it.
I know there's other options to take in that form of a situation, but at the same time, there may be times when that option may be needed, and it would likely cost you either a high % combo, or a stock (Thank you, Strong Bad). Either way, I'm sure the Up-Smash changes is a hit or miss type of deal, so take your time in finding what would be right for the character.