Question Trying to spawn an array of meshes using vfx graph

I had been following along this tutorial:

It works great but as you can see at timestamp 7:39 each succeeding column of books has a certain offset.
And in my remake of this using my candle asset the offset was even greater.

(notice the offset on each column)

My try at doing this:

(the value from Vector3 is input into the SetPosition)

Here I was trying to separate the particles into buckets using modulo with particleId simply multiplying this with a float for z coordinates, for the y coordinate I test to see if the module for that particleId is zero only in which case I multiply y coordinate with float.

(after the first row the candles start getting same z coordinate value)

The result are not as expected.
How would one go getting the desired output?