Looks like you have a good kit to me. You have a 12.8lb base weight including your camera-- from here it is a question of how much farther you want to go, at what price, and at what comfort level. The difference I see in the SUL kits is less comfort and fewer essentials-- no extra clothing, minimalized sleeping gear, shelter, cook kit, no knife, few first aid supplies, no cameras or other electronics (not listed anyway), and so on.
BTW, I didn't see navigation or signaling gear in your list. Do you carry map and compass, or a whistle?
As to packs...
I chose the GoLite Peak pack to use for day trips and light summer summer 2-3 day trips. I can adjust the pack for the volume I need. I found a framed pack to be more comfortable and stable for heavier loads. Having two packs for highly variable loads makes sense to me (that tis what I do).
No one single pack is going to handle a wide range of loads *well*, but a large pack that has some compression features will do--- you may be carrying extra pack weight with the smaller kit.
What pack you choose is simply feature set, comfort, volume, weight and price. For my own use, the feature set is mostly external water bottle pockets, and some outside pockets. I do like something with reasonable durability and cost. The rest is a choice of framed/frameless and volume--- higher volume and weight=framed. Lighter and smaller volume=frameless. I find that framed packs are easier to load as I'm not worried about the lumps and bumps of batches of gear settling against my back.
I can get my hot weather kit down below 8 pounds and there isn't anything all that large to deal with-- some spare clothing, a 1lb down bag, small sleeping pad (Prolite short), and essentials. The rest is food, water and cook kit. It really only varies from my day pack by a couple pounds, less consumables.
As I get older and grumpier, I've grown tired of trying to pack everything too tight. A little spare volume and having things more organized works for me. That means a few more ounces than optimal, but I'm willing to make the compromise and not having everything floating around loose and taking more time to pack up in the morning, trying to jam and tweak the gear back into the pack. There is some perverse law of hiking physics that says your kit will never be as small on Sunday morning on the trail as it was on Friday night when packed at home-- shelters and sleeping bags topping the list. I am through with packs that are big (overstuffed) stuff sacks with shoulder straps, that ride high and bouncy on your back--- my "rabid raccoon" analogy. I am all for wider packs that can compress the load closer to your back and ride stable.