I have not had anymore issues since that ride but I have made a few slight adjustments to my pre-ride routine. I make sure I am fully hydrated the night before (sucks for night time sleep with the bathroom wake ups), take vitamins the night before and while I am still going out "fasted", I am drinking more water in the morning and only 1 coffee. I also have been adding more apple cider vinegar to my riding water bottles.
So far, even with temps well into the 90's, no issues but I haven't gone out as long nor climbed as much since either. I hoping it was just a freak thing due to many conditions being generated all at once. One thing I forgot to mention when I started this post was that I was riding with 2 cracked ribs from a mtb accident 2 weeks before, so my breathing was not as good as normal and maybe contributed to the severe cramping.