My horse just got to a body score of 5 of 9. However, she was switched to cubes from hay because of my location; hay is expensive, and local is poor quality. So the cubes may have contributed to the abscesses? She is cleared now, and her frog has hardened nicely. Her paddock is a swamp when it rains unfortunately (I am looking for a new place to board).
Another vote for Keratox to harden the feet. However, I would be looking at a diet issue. You say the horse has come from a dry climate (usually little grass) and has moved to a rainforest climate (usully lots of lush grass). The horse could be IR or it is simply to much of a dramatic change for his or her system to handle. IR often results in continous abscesses. Is the horse overweight?
Usually you can use keratox hoof hardener. It's a little expensive but a little goes a long way and the results are quick
Hot turpentine on the soles works great!
I'm not sure about iodine but Turpentine works great!
Iodine especially helps with thrush
Keratex Hoof Hardener works well.