If you can't, don't or won't figure it out, you're bound to repeat it. If it were me, I would be checking myself for a PFO, and if that was negative, I would never go into deco again.
As I said earlier, for unrelated reasons I have had the test used to detect PFOs. In fact, I have had it twice. I don't have a PFO. I have done a ton of decompression dives over the years without a hint of a problem. If I have a regular physiological problem that caused it, it should have reared its ugly head long ago. I was in fine health for those dives, and they were really wonderful dives, among the most enjoyable recreational dives I have done in a long time.Is it? John indicated that he did 3 times the deco that was required. That's a lot of padding, n'est pas? He hasn't indicated that he was inordinately cold, tired, sick, hungover and so on, and knowing how thorough John is, I doubt that any of these other vectors existed.
I haven't got a clue what I would do differently in the future.