So, you are saying that the projects do not scale properly even if all settings for scaling are turned on ("LCLScaling" and "DPI awareness" on - both in project options, and Form.Scaled = true for each form)? Strange...
No idea if this means anything, but are you sure that the exe file is not set to any compatiblity mode? Right-click on exe in Windows Explorer > Properties > Sheet compatibility: The checkbox "compatibility mode" should be off