As it is now, a decent chunk of the content is more or less the same with characters swapped out.
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Even a lot of the words and vibes are the same, despite different personalities and, presumably, motivations. Go the dance and it'll be the same slight difference for confidence level, same choices, and either high confidence they go down on Aaron or low confidence they go down on someone else. On someone else, they'll say something to half-heartedly dismiss what they're doing, the guy doesn't believe it and thinks she just wants dick, and she sheepishly says n-no and Aaron doesn't believe it either.
There are differences, like Luna is a bit more lusty, Quinn says she wants to learn to impress her boyfriend, etc., but I think it's maybe one sentence each?
So, rather than replaying, it seems more like a game that you pick whichever girl you superficially like the most and you won't need to worry about replaying to see what scenes you missed.
I do like Quinn wanting to practice so she can do something impressive. The nerdy girl that cheats because she feels she'll be a better girlfriend if she has experience is a pretty under-utilized approach to NTR.
It generally didn't matter about confidence level, it's the mixed sharing situations that messed with it. But I did keep confidence -1 to +1 the first time through because I want to actually make progress with the girls and not miss out, but in the long term I want them to cheat.
The first time trying it, I expected the cheating to be much later, so keep confidence above the negatives but still low so I can quickly drop it down to negative once the relationships are solid and cheating starts. That was basically my logic. I didn't think it'd get start so quick.
NTR has little impact if this girl I just met and am only starting to get to know is getting slutty. She should at least be my crush, ideally my girlfriend. I know this isn't a slow-burn game, and I wouldn't try to change your mind on that, but just a
little more restraint would make some of it land better.
Also I'm surprised you didn't expect mixed sharing. Though I picked based on who I thought would have better NTR content or who would have better NTS, I would think there's a decent number of people that would pick exclusive for girls they like and share the ones they aren't really interested in, while trying to get them all regardless.