personally i think that alcohol produces better time readings (MDS files) as blindread (BWA files).
i make one image in the mdf + MDS format and one in CCD format.
convert the .MDS to .BWA and then twinpeak the CCD image.
burn the patched CCD image again with alcohol.
this method never let me down yet, and works the first time
with the BWA builder is was a hit or mis, never sure it would work first time. sometimes needed to remake the BWA file for 4 times before it worked