Issue description
Problem: Stacker Tower struggles to find room to dump near the end of each dumping range, due to constantly needing to rotate to fill the last few rows of tiles due to them already being mostly filled up.
In the attached save, you can see that the tower is struggling to empty 650/min of material despite having a listed throughput of 900/min.
Recommended solution: Make the tower prioritize the tiles needed to build extensions, and request extensions to be built long before most of the current dumping range is full requiring it to search the edges for bits of space.
Reproduction steps
Save attached showing a scenario where this happens.
Game version and build number
v0.8.7d
Operating system
Windows