Really on the fence with this one. 4X is a star in some things and disappointing in a lot of other ways. The 3X was always a star, to me. I'm really thinking the 76 keys makes a huge difference and wish I had that version to compare. Currently, not sure if I want the change.
So your dumping the Pa4x? return time not up yet? at least you gave it a try maybe just stick with the pa3x as its working better for you....no need to change just make what you got better and better.
good luck