#1
I'm having some trouble with pull offs. I have been making a conscious effort to kind of flick the string when pulling off a note, but when I do this on the lower strings, it bends the note slightly and doesn't sound right, even when I practice really slowly. I don't want to blame my strings, but they're .11s in D standard if that makes a difference.

How should I fix my problem?
#2
Sounds like your being a little too hard on the string. You may be pulling the note out of tune before releasing. I just lightly flick and at the same time pull my finger up.

I also use .011's in D standard, and I think they work pretty well for that tuning. just try a gentler touch and see if that helps. It takes a long time to develop good legato technique.
#5
Yep, you're probably flicking too much "down" when it's actually "out" from the fretboard as much as down. Don't forget that you need to have a little pressure on the finger you're pull off to if you're going to flick that hard.