Ok. Because this is the hardest thing to understand for some reason, i present to you a picture.

On the left, there is a 2x block. On the right there are two 2x blocks right next to each other (as you can tell becuase they are different colors). Simply put, i want the right side to not be 2 bricks, but instead one big brick. in doing this, there would be less lag, making certain roof types would be easier and well there a +45 and +25 Degree 4x ramp so why not have an negative one?
This is not that hard people.