Hi mate
i do mine on 1 and 2 too.
but ive never yet had anywhere near enough space to bounce the other tracks to 7 and 8.
Id been recording as much as i could,,,
then recording it all onto Mini Disc,,,
Then scrubbing those tracks,,,,
Putting the MD track back onto 1 and 2 and continuing.
yes,,what a procedure that is.
Ive since got N-TRacks,,
but ive ben a really lazy bastard and done nothing since before christmas.
Good luck with it all.