Interesting read, thanks for sharing! It's a shame but as you said, at least your diabetes wasnt to blame. You had that pretty tightly controlled, I'd have been chilling in the 4s by an hour in!
On the days I go for a run (still only 3-5km with some walking) I only take 1u levemir instead of 3 and I skip my Novorapid with dinner..... And STILL hypo before bed. Feeding the insulin seems to defeat the purpose of exercising in the first place for me. I end up eating more calories than I will have burned!