Right now I don't think I'm going to make any more changes.
But history shows that as time passes, I find more efficient chords. So you never know...
Keep in mind every time I make a change, I have to re-learn a new chord. So changes are not easy for me either.
The layout has been stable for a while though and recent changes were due to Twiddler firmware being fixed and thus allowing more optimal position of the most used chord "Space" - MOOO.