I've never tried to split up the AVCHD files that way, always just used NLE that accepts the files as 3D, but I believe it should be left first, then right, it typically is. The NX3D1 is just the pro version of the TD10, otherwise it's the same camera and from what I've read it's the same quality recording, so not much improvement over TD models. Adds XLR and 24p. 24p is really 23.976 and so is Blu ray 3D. You could also output to 720p60 and see how that looks to you if you have fast motion it could smooth things up with less judder.
With 1080i60 3D, I always deinterlace to 30p but I'm just outputting to half resolution files. It is also possible to keep full resolution in 24p/30p using top/bottom full but it will only work on 4K LG's. Other full resolution option is MVC output but you will need something that will play the files like PDVD.
As to what frame rate of recording 3D...I think you have to take each project into consideration. What are you shooting, fast movement or scenery, and also what is your desired delivery? So if you want less judder, 60i may be better, but if Blu ray is desired output, then it becomes problem with 60i to 24p conversion (or you could use 720p60 and see if that looks better for you). There is the drop in resolution but you would keep the frame rate equal. Personally, I prefer 1080p24 since it's progressive scanned but I find for a lot of things 1080p30 looks good if I'm not going to Blu ray.
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