The "Even" Distribution is correct because it measures the Spline distance between each clone.
Here's one way to do it:
Clone using Linear mode.
Use Spline Effector to place them on a flat Helix
Use a Step Effector to Raise them to the level you want.
https://www.dropbox.com/scl/fi/pz7s65lu2tq4m8pk6o8x9/clone-on-helix-Fixed.c4d?rlkey=bmh6dgp5juiuewrqszkk30ds1&dl=0