Your spreadsheet has some interesting elements. WS per kilogram - nice!
To put it in more broad, simple terms: the AD200 in the twin head is significantly lighter than the 600, at least in my book - about 15% lighter. It obviously affords you the advantage of packing smaller, and the flexibility of taking only one head, or separating both for key/fill or key/rim, etc. Also, because of it's slightly lower output, it recycles faster. It has a better modeling light.
The downsides: in a hard modifier like a magnum or long throw, it projects a double shadow, so for my purposes, if I want the "magnum look" it's either that I center a single bulb and accept the halved output, or I use the 600 for my key and move the dual 200 to fill in a socked umbrella. And this is in fact how I often work with a 600 and the twin head 200s - it's a good strategy.
The 600 remote head is awesome for booming. I just shot two dancers recently and did the first shoot with the 600 boomed, and swapped it out for the remote head on the second shoot and it's really a pleasure to use in those circumstances.
I'm not trying to dissuade you or challenge your idea of what you feel is right for your workflow, just trying to put some of your numbers and expectations in context. The twin head brackets for the 200s is a game changer and for some applications the best tool currently on the market. I've been shooting food with a really spare setup using two 200s and the packing size, mobility, output, weight, lack of cables make it a dream setup. The small 7" reflector that you can get for the bare bulb is super efficient and when you throw it through a piece of vellum or similar frosted plastic it's a really nice source. I'm getting ISO64-ISO100, 1/160th, f/9-f/11 using a pair of 200s at 1/4 power in this way.
Hope you're happy with your setup and find it supports your creative endeavors
So I have decided on ad600bm+h600b (against 2x ad200 + ad-b2). I have tested how happy I would be with 2.5kg on top of stand plus 1kg modifier and I felt remote head would be best for me (and I can get by with lighter stand so "bag" weight of ad600bm+h600b might be quite similar).
With deals available (ebay, no local deals), the price of kits including 2x ad200 + ad-b2 would be about 50% more than kit with ad600 (which also includes better modifier). I can do kicker light for overcast weather with small flash, I don't need second ad200 for it, at least I hope.
If anybody is interested in comparing ad200 and ad600, I have a lot of resources in shared spreadsheet: https://docs.google.com …YnQr0CqJv56SHI/edit#gid=0