Food storage: If you're going to RMNP, a bear canister is required. Otherwise, you need a bag and some cord for hanging or (if, like me, you can't throw) an Ursack.
If you're going to be at high altitudes, you want something warm and dry on your legs. A lot of nights will be below freezing and it can snow any time. (I grew up in Wyoming and Colorado and have seen plenty of summer snowstorms on trips I've taken back there since then!) Do you really spend a day traversing a 12,000 foot ridge in a snowstorm in only shorts? That NeoAir is going to be pretty darn cold when it's below freezing; consider a piece of CCF pad to go with it.
I never trust manufacturer weights because I've found that they're usually understated, often seriously so. I've returned stuff where the weight was grossly understated! For clothing, the weight listed is probably not for the size you wear. It takes more time to look up weights on manufacturer websites than to weigh the stuff yourself, lol!
As for a scale, it has lots of other uses: postage, cooking from European recipes, measuring food (even if you're not dieting, don't you want to know the approximate calories in what you're taking so you know if you have enough to sustain you?). My spreadsheet of all my gear items is even more useful as a checklist than as a "pack weight control" device. But if you really don't want to go there, at least weigh your pack on the bathroom scale (yours or borrowed) rather than a random guess. I have a strong suspicion that it will be a lot more than your estimate!
Light source--not on your list? Something with which to light your stove? (Don't count on built-in piezo lighters; they tend to malfunction in a year or two.) If you're only boiling water, why such a heavy. kettle? A KMart grease pot, with a piece of wire substituted for the knob on the lid, is 3.6 oz. and $5. Do you at least take a map? A compass can be good to have in a whiteout. How do you use the Steripen with a Platy bottle? Having had a Steripen that was almost useless, I strongly recommend backup chlorine dioxide tablets.