Find the FPSC folder containing the enemy Characters you want to scale.
Each Character has an .fpe script file associated with it in there.
Open the Charaeters .fpe file in Windows Notepad and look for the line that says :
scale =100 or it may be set to 80 for V1
Change the scale according to your requirement.
i.e. 100 is actual model size. 80 is 80% of actual size. 120 would be 120% of actual size. 200 would be 200% or twice the original model size.
Backup any files you want to change to be on the safe side before proceeding and Good luck.