Your b+2 / b+3 xx EX ground spike combos are the most damaging ones that I have seen. I will have to steal those. LOL. However, b+1,2,u+2 combos are not very practical because b+1 is 16 frames and hits high. You should concentrate on f+4,2,1 combos because that is Freddy's best string. I use the following for f+4,2,1.
f+4,2 xx close ground spike, b+2, f+4,2,1 xx far ground spike, far ground spike. 30% of damage. No meter.
f+4,2,1 xx EX ground spike, JP, f+2,1 xx close ground spike, f+4,2,1, far ground spike, far ground spike. 43% of damage. 1 bar of meter.