Actually, stirring before feeding is good. If you keep a drier mix, usually the top gets drier and there's a juicy layer further down. Stirring not only helps the consistency, but also gets the top SCOBY mixed back in. That's my two cents. I would never not stir before feeding.
I just stir the top to mix in the scoby. The bottom has a liquid sometimes and I let it go for a couple of days then add more to it. Easy peasy