Last night I upgraded to 3.1 using Pwnage Tool on OS X (so my BaseBand is still at 4.26.08). I'm now seeing poor battery life, and don't pull in as strong a signal, and have had a "coma" once already.

How do I go about downgrading to 3.0.1 or 3.0 (on a Mac)?

I've also seen mention of not restoring from a backup as it can cause battery issues. But if I don't restore from a backup, I found that I lose my Cydia apps (backed up using APTbackup). Really it wouldn't be a huge deal to re-install my Cydia apps - but there are a few that I purchased, and I don't want to lose those.

I'm guessing APTbackup just stores a file somewhere - would it be possible to SSH that file out and then back in after the downgrade?