Hi,

I have make a test and it is probable the redstone need drop redstone ore but ;
Dense redstone ; 4x64 + 45 "redstone" and with Fortune III 4x64 + 32

For normal redstone in same test of 100 block ;
7 x 64 + 8 and with Fortune III 9 x 64 + 16

Possible error is drop bad redstone but originaly it is 1 to 4 redstone ore.