Coalesced.ini needs to be decoded before it can be edited; use TF Games Configuration Utility.
Coalesced.int contains localization settings and must also be decoded.
The game crashes when Hardshell launches rockets for the 2nd or 3rd times. This might because of your Nvidia Settings.
Go to the NVIDIA Control Panel, Manage 3D settings, Program Settings, Add (<path-to-game>\Binaries\TFOC.exe), then select High-performance NVIDIA processor.