Try adding these to the FPE file. Try the first one alone first and see if that fixes it.
resetlimbmatrix = 1
collisionscaling = 120 <--- Play with this number if needed. Try 18 and see how that works.
The ideal thing would be to export it out of blender at the correct real world size. It may take a few times to get it correct. But Gtox's scale ratio sounds right.
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