So, 2 full months after I bought my Shimoda Design Explore 40 backpack, they opened a Kickstarter for a new line of packs. Called the Action X series, they're basically a collection of improvements, many of which were universally requested by owners, including myself.
A week before the Fremont hike, I grabbed a Shimoda Designs Explore 40 kit from Glazer's Camera. After transferring my gear from the LowePro to the Shimoda, I weighed it and it came out to only 24 lbs. Once I fully loaded the pack with extra clothes, food, water and the extra photography gear needed, it topped 42 lbs. Despite the extra weight, and with a pair of hiking poles, I made it up and down the mountain with my back in far better condition than the previous 2 weekends.