Sounds as though you are a man after most of our hearts. I too like Busse and their derivative companys. Though on HI's I've only used one knife with a slab handle and it was defective. Would love to try some again. Had an M43 with slab handles but never used it before it was sold. The current owner tells that it is awesome.
25 onces seems to be a nice range. I'm 6'5" tall and weigh about 180 pounds. Grew up on a farm and used a 5 pound maul to split wood. So a 5 pound Khukuri is okay for something to me. But really I grab my blades in the 23 to 25 once range the most. My 15" AK is about 28 to 30 onces and the spine is 1/2" Thick. It's only used when I'm going to be limbing a tree or when I need something just masive. One of these campouts I'll bring it and test it's chopping against my 24 once 16.5" WWII should be intersting.
That AK I have sounds like something you may like though. It's tough!! Bought it used from Uncle Bill. It was beat on by the previous owner for something like 5 to 8 years then traded in for something different. The tip was bent, handle cracked in 2 places. Turns out the previous owner used it to remove stumps and to pry and dig. I pounded the tip back in to place, JB welded the cracks, took the edge from blunt to a rather sharp toothy edge and put a brushed finish on it.
My 20" Sirupati Lisa feals like an extention of my arm, so I know how you feel about your Kobra. Light, fast and Agile. I love using it even if sometimes it's not as good at chopping as my WWII because it feels so natural in my hand.
If you are in Utah or going to be in the area sometime you should let me know so we can talk and Show Khukuris and other tough blades.

Done that with a few guys from the forums and it was fun each time.
Heber