As far as I know, that is the cap. Adjust and tweak your models and maps to meet the requirement is all I can say.
I see you just joined the forum today, not sure if you just staarted using FPSC today though. In case you are new to FPSC all together I suggest starting with the guides provided with the FPSC install.
FPSC Menu "help" > "read manual"
Also, the 1st community guid is in "Program Files (x86)\The Game Creators\FPS Creator\Docs"
The newset community guide is
here
Overall when creating models and maps, keep in mind, "Low-Poly".