Genuine question, why is it too heavy? I don't use my iPad for notes but if I did it would be resting or laying on something. Is your normal usage to write notes while you hold it unsupported? Trying to understand the use-case
I think it is a combination with the size, I find it much harder to have it properly supported when not resting it fully against something. Saying if I am holding it and have my leg as support and so on. I don’t have a ton of experience of writing on the 12.9” mainly because I couldn’t find a way to be comfortable and just put it flat on the table. Never had that problem on my 11”.