Yes I have tried all those. I worked in the centre of this technology in Germany and America. Isn't it amazing how we look at something and just feel awkward from our experiences with things.
I do use support for my hand with the mouse advertised at NZ RSI shop and find it's so relaxing how the mouse moves and my arms can stay so relaxed, with my palm vertical and open and my arm rested on a gel cushion.
I thought I was beginning to go crazy in that none of those solutions others have mentioned worked for me. But without this mouse I couldn't have returned to work at a computer and it is my saviour.