soundforge does not cut on sector boundaries and will thus introduce clicks between tracks. IMHO there's no better application for splitting up wav files than cdwav.
DNS is correct!!! Do any and all Soundforge work first, then make your track cuts with CDWave. This will ensure (insure??? assure???) good track marks.
I also recommend trimming off the first 0.01 and last 0.01 seconds with CDWave to have nice clean ends...
Your lineage should look like this:
JB3>USB (or Firewire)>WAV>SF7.0 (edits, fades, etc...)>CDWave (tracking)>SHN (or FLAC)
Good luck!!!
Terry