How do I evenly distribute my three text boxes so the vertical space between them is even? The boxes want to snap to the grid.

That is how Fluid Engine works. Blocks scale based on size and relative position in the grid, not (for example) based on how much white space there is after the text. Make each text block the same width with and leave an equal number of grid spaces between. Assuming you want the text in those blocks to remain the same size, that's about the best you can do with the native editor.