you might be able to go something like 64 ntn as there is not much stress at the tips.
on the last pic, trace a ring line that is on the left near the swirl towards the good end, does it go down and to the right?
I should also ask if you have ever shot a bendy handle NA style bow before, and do you use a broken wrist grip?, the reason I ask is that unless you have quite long arms, there might be a good chance you don't actually need to pull 28".