This is driving me crazy. If I try to grab a kit piece to move it around with the snap to grid on, when I grab it it always moves it on the Z axis down around 10 clicks then on the X or Y axis where I want it to go. I basically have to use the up and down buttons to move stuff. It's insane. I can even hold the X or Y key to only move on that axis and it still moves down every time. I'm pulling my hair out. Any suggestions? (I'm set to 128 now, but it does it at 64 too.)

Hold X to move along the X axis. Y for the Y axis. Z for the Z axis. If this isnt working for you, then reinstall the CK and move on.

For solitude pieces i have 90 degree snap and interval of 4.
yeah, that's right, 4.
works like a charm!

I had something similiar to this with the NV Geck. As I dragged an object around, without holding any keys, it would move along the X and Y, but also downwards equally. It was really annoying, but I don't remember what caused it or how I fixed it.

The buttons to move objects in certain axis sometimes change for me, don't know if it's a bug with the CK or something. Most of the time it's the up/down axis and I have to use X to move objects on Z-axis. Re-opening the CK fixes it every time though.