To go back in the water and attempt IWR less than an hour from a chamber is like performing surgery on your self the same distance from a hospital. Yeah, if you have knowledge and equipment it can be done, but at the same time if you have that much knowledge about deco theory, you know at that distance its better just to go to the chamber. Jumping back in on air, without any real IWR plan is no different than me stitching up a real deep cut an hour from the hospital. Sure, I stitched up my hand one time with fishing line, but when I cut myself real bad, I went to the ER.
Really, it was a bad idea to make that dive, followed up by another bad idea to attempt IWR.