Hello Kor,
and congratulations on your summit. I've personally been fighting off a knee injury this year, so I can appreciate what it took for you to hang in there and get to the summit. I'm no lightweight backpacking expert, but I've also been trying to lighten up for the past 15 years. When I started, I was carrying an external frame pack, wearing blue jeans, wearing one sport Moraines, and basically carrying way too much (probably 55 lbs. for a week's trip). It didn't take me long to ditch the external frame, get some nylon clothes, and whittle the pack down to 35 lbs. for a week while still carrying a full tent (Sierra Designs Light Year) and a full length sleeping pad and sleeping bag. Now, I want to get under 30 pounds for a week while still carrying a real pack and a real sleeping bag. A couple of resources have been especially helpful to me in this quest:
www.backpackinglight.com This website, while designed for the PCT crowd, has a great forum and menu tabs to help anyone get started lightening up. And then there is Andrew Skurka's home page. I'm not sure if you are familiar with him or not, but he has been doing some amazing things in the past five years and his website goes to great lengths to explain how the rest of us mere mortals can do likewise. In fact, here is his gear list for when he did the Sierra High Route back in August of 2008:
http://www.andrewskurka.com/SHR08/gearlist.phpWhen you read his site, you can see how he makes a real science of studying his environment when planning his equipment. In other words, he tailors a separate array of gear for each trip through interviews of other hikers, study of his terrain, and average climate data for each specific area . The one above is most relevant to Whitney.
I haven't yet brought myself to give up my tent for a bivy or a tarp or use a quilt, but even if you adopt half of his ideas, you are bound to lighten your load by several pounds.
I also noticed in your write up that you described how you became more dehydrated and tired in the higher elevations. I've faced this (and continue to). Lately, I've been reading Mark Twight's book Extreme Alpinism. Ok, so taking the main trail to Whitney isn't extreme alpinism, but Twight has great things to say about training, motivation, clothes, and especially nutrition that can help anyone in a high endurance activity. Basically, he turned me on to gels and electrolyte drinks, which I had sworn off along with bars years ago in favor of water and whole foods, thinking I was saving money. What I discovered was that I had a lot more energy up above 13,000 feet when I followed his advice. It should be common sense, but he explains that when your body is working as hard as we do when we climb Whitney that you can't process food because the muscles take too much blood away from the stomach, so electrolyte replenishment drinks and gels are the only efficient way to maintain the proper percentage of glucose in our blood hour after hour to maintain energy without "bonking". I wish that I had been doing this in two previous climbs earlier this year on Shasta and Whitney; I would have felt a lot better and moved a lot faster. I think that adopting these lightweight and alpine philosophies translates into increased safety based on the dictum that "speed is safety" in regards to traveling efficiently through dangerous terrain. Way back in the 70's Yvon Chouinard said that if you carry bivy gear you will end up bivying, and Mark Houston and Kathy Cosley echo that refrain in their book Alpine Climbing: techniques to take you higher. While we may not be making single push alpine attempts, we can all gain something by seeing what these world class alpinists are able to do and do without. My sincere apologies if I am preaching to the choir to you in regards to any of these things. More importantly, nutrition, training, equipment, and comfort are ultimately subjective items that we must all figure out for ourselves by experience. Good luck in all of your future climbs.
Lee