Below are a few ideas I had after reviewing your lists. Feel free to take or leave any of them as you see fit. I hope some of it helps, even if in a small way. Oh, and good luck on your journey!
You both have pretty solid lists, IMHO. I'm glad you're asking the boys to carry personal First Aid kits - my troop's 2004 and 2006 crews were discouraged from same in lieu of a crew kit. Personally, I'm not excited about digging into the crew kit for minor issues.
I'm also recc. that my crews wear SPF clothing and wide brimmed hats vs. using sun screen. Sun screen is heavy, messy, and takes lots of time to re-apply. The SPF ratings have been proven to be massively overstated. I'm a big fan of the EMS long sleeved, T1 shirts - I've worn them in East Coast summer heat without issue.
Like Doug, I recc. taking a hard look at the Crew Gear. Philmont gear looks super heavy to me, especially the Chef's kits. Instead, we'll be using MSR reactors and turkey bags this year.
I have not had success keeping clothes dry in zip locks for trips that last even as long as a week. They tend to break down. I know they're expensive, but the Sea to Summit Ultra-Sil dry bags are super light and last a very long time.
I'm not sure what the contact solution is for. If it's wound irrigation, I get it. If it's for contacts, my recc. is to have the boys leave those at home. Trail conditions aren't super sanitary, and I really don't want to have to fish one out of a boys eye in a medical situation.
My final tip is to get the trekking maps and plot your course, including water re-fill optys before you go or decide how much water carrying capacity you'll need. We're going to deviate from our suggested route to hit Big Red on the way from Phillips Camp to Cito. I haven't mapped it out, but 4 liters per person isn't goiong to cut it. My best guess without doing the math is 6, it could be more. That's one reason why I'm advocating bladders over Nalgenes for the bulk of our personal water carrying capacity. I've also been using a used Gator-Aid bottle in lieu of a Nalgene for 3 season camping - cheaper, and lighter, but still darn tough (I've used one for my last 150+ miles and not one problem).