I would like to suggest a smaller grid. One that will allow planks and beams to butt up to one another. The case Scenario: One that will allow planks and beams that want to be a bugger to lay in a grid when size changed to fit a build & then grid will not in either span + or - lay correctly.
Another option on Grid: Rolling span so laying a plank or woodbeam in a circle is possible to (Keep Grid)
A possible solution on the smaller grid. The scroll ball forward & back when G for Grid is used. Smallest size grid: 1px by 1px of form size being placed -H -L