What are you using for a mic? Mic-pre? These two things matter big time. I record in mono cuz I only got one good mic. But even if I had more than one, I'd still record mono unless I wanted the sort of effect stereo recording gives. I've got no special set numbers for reverb or delay, etc. I just use what sounds good in the mix. Compression is a big deal too. I've got this built into my DAW. But having something like an RNC helps alot. As far as the settings, these always change with vocalist, room, etc.
Also, record clean and harsh vocals on separate tracks with different input levels. If you use the input levels for you clean vocals, when you start screaming you will generally read-line and get distortion.
Oh yeah, don't eat the mic either. The sweat spot on most mics is between 6-20 inches away. And I'm assuming you are using a pop sheild. If not, invest in one or make one out of a hanger and nylons er something.
BTW, what do you record on?