I didn't quite follow your ages or planned years in your post. But if you're talking about your wife leaving at age 45 with 20 years of service and not collecting until she's 60, better make sure she can in fact defer her pension payments or if the employer will force her to take a lump sum up front. And find out if there are any other potential gotchas or penalties involved. Are payments indexed for inflation? Can you also collect SS? What if she (or your marriage) doesn't make it to 20 years of service for whatever reason?
Also, that's quite a way into the future, how certain do you feel about the ability to collect the pension at the stated benefits? Many pension plans have sadly gone under or failed to pay out as promised, and if you're banking on that, there could be a sad realization later.
If it was me, I would max out my 401k contributions and other savings regardless, both to have enough savings without the pension, and to take advantage of all the tax savings right now. Then when you get closer to FI, you will likely have a better idea just how much you can rely on that pension in your plans.