As far as eating every 15 minutes versus 30. I typcially don't eat that often either, but that's why I ate smaller chunks of food during RAIN. It was less food but more often. I think it helped.

Wow; a 130-mile ride a week or so before RAIN. That's more ambitious than anything I did to train for it, and I have to wonder whether a week to ten days will be enough to recover from it. Maybe I'm just slow to recover, but I will tell you that took me about two full weeks after RAIN to feel like myself again physically and mentally. If I were you, I'd either forego that ride altogether or do it at least two full weeks in advance. I truly believe that your base is more than adequate as is. But perhaps some of the ultra-distance cyclists on TE will chime in on that.