Start again, go a tad longer. Aim for 2" wide at the widest, just tapering over the last 1/3. Don't have thick unbending tips or a long unbending handle. A total of 4" stiff at the centre is plenty, the more of the bow that bends, the less stress at any one point.
Slow and steady wins the day.
Good luck.
If that was one small splinter lifting, it could be chiseled out and a piece let in, but I think it's too far gone.
Del