I assume this is on your JTAG due to your connectivity requirements.
Normally, I do not advocate the following, but I've made a personal exception due to the questionable (development?) autosaves of this game.
Grab data0.Pak from the DI folder.
Open it up with your favorite archiver
Browse into data/Skills
Open up charname_levels.XML
Change the max health for your level to 9999.
Save that file in the archive.
Drop that archive back into place on your 360's gamedir.
And once you've beaten that section and reached the random autosave, undo the change you made.
I did this after a respawn landed me on another part of the island (never visited) , right in the middle of a fight I couldn't have been prepared for.
(btw, retail disc-> nxe2god-> god2iso > xexrip )