OP, are you getting any pension benefits as part of FIREing? You say you aren't getting payments until 65, but did you have additional years of seniority added as part of a package, or something like that?
I ask because benefits like that are NOT covered by the PBGC. My former company went through bankruptcy, with our pensions going to the PBGC. The ones who were worst off were those who took early retirement packages. These were more than what you describe, with promises of full pension payments beginning as young as 52. Under the hood, though, these payments came from the pension fund itself, and when the PBGC stepped in, they were not covered. So, these people made headlines, losing up to 70% of their promised payouts.
I have a partial pension because I didn't have so many years of seniority. As it is, I have 100% coverage. Looking at your payouts, I think you would be, too, with payouts beginning at 65. (And hooray for an old-age payout that won't get bumped back to help keep SS afloat!)