Compressing, footing and tapering makes for a nice heavy cedar arrow, but it doesn't increase the FOC as much as one would think. For example, my footed,compressed and tapered cedar shafts with a 160 grain STOS yield about 14% FOC. A heavier head might get you to 15% or a little past. Mine are spined 75-80# and weigh about 680 grains, plus or minus 5.
Got my shafts from Cedarsmith. He starts with 23/64 shafts and compresses them to 11/32 using some sort of compression block. He then grinds a 9-inch or so taper to 5/16 and footed mine with wenge.
I suppose a heavier footing woods might also add 1% or so to the FOC, but that would be about it unless you extend the length of the footing like Bjorn had done.
The metal ferule and extra heavy broadhead (200 grains or more) hold promise for really jacking up the FOC of wood shafts. I've noted on here before that I've also done it by drilling a 3/16 hole in the point end of my 11/32 shafts and inserting about 3 inches of steel rod before point tapering and adding the broadhead. That, and a 160 grain head gets my 11/32 tapered cedars to just about 20% FOC.