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I used a screwdriver to bend it out to the same angle and the 26.8 fit well!
Yep, this isn't all that uncommon; the giveaway is if the edges of the slot aren't parallel. It's a good idea to tickle the inside of the slot with a file after levering it open again, to ensure you haven't created a slight dag that will scratch the post.
How far have you tried to get the 26.8 in? Does it get easier after the first couple cms?
Does the seatube seem straight or have any knocks in it?