Let’s start with a question: is that the correct size clamp for the down tube? Clamps come in 28.6, 31.8, and 34.0. That may be a 28.6 on a 31.8 tube.
If the clamp is the correct size, then tou have some serious alignment issues. Very difficult to correct alignment on a cast part like the clampwithout splitting it.
Cage can easily be bent into shape, but the clamp...