Honestly same. There are times I do notice something off about the writing but ignore it, thinking that's how the author's writing style is like.

I do remember one fic having so many inconsistencies. It couldn't get the eye colour of a character right? But ofc the most common AI writing habit is abusing the hell of out this prose (i dont know the term but a moot described it as rhythm-like prose) - not x or y but z.

For example: "Yuuji's pecs felt spectacular. Not too small, not too large but just the right volume to fill my hands." I mean normal writers use this too but AI LOVES it.

AI also loves using one sentence per paragraph for the dramatic effect (but ngl I am also guilty of this sometimes) and purple prose (overly dramatic and fancy).

But your method works too. I remember this one author who updated chapters frequently. I thought maybe they already have the drafts so that's why they're so fast. But their fics were later suspected to have been written by AI (they also had the not x, y but z prose).

I hate that we've come to an era where we have to become literal detectives to see whether we're looking at something made by fucking AI. 😭