Can pylon recast be edited?

Im not sure where to look as i cant seem to find the info i need in the pylon.uc. When we build paths with pylon and use the recast option there is always some space left between the collision of a wall and the red generated path from the pylon.Is it possible to edit something so that we can have the generated pylon be as close to the walls as possible?
This problem becomes obvious when we create a pylon in tight corridors and we have so much space not used between a flat collision wall and the pylon generation.

Also, anyone knows what the PylonSeed from actor classes does? Its not documented and at simple try it doesn’t seem to do anything.