Don't pre-heat the plank.
Cooking times will vary based on how hot the fire is and how far from the fire the plank is, etc. Also, the thickness of 4 pieces of filet that total one pound will not be very different from a single piece of filet that weighs three pounds. (the 3 Lb piece will be longer but not thicker). I would expect the individual pieces to cook a little faster than a single piece because the heat can get to more edges on the single pieces. But I'm talking 10% less not half the time.
As always, the internal temperature is the final determinant, not elapsed time.
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"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan
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