I had these exact same problems a couple of months ago, strings ringing out, trouble bending right up to the note and so on. Best tip from me is just keep practicing, I just placed string bends into my pratice routine, listening carefully for the sweet spot of the note I am bending too. It didn't take too long before I had the strength and the technique to get them sounding sweet as.
Sometimes strings ring out a little every now and then and my bends are sometimes a little flat or sharp, but I have improved dramatically in a short period of time, and with more practice I will be more consistant. Everyone goes through these learning stages, and with practice you will see rusults, like muting the other strings will just come naturally with your palm or your left hand.
Watch J's videos again, everytime you watch them at different learning stages you will pick up on something that you did not before. I revisit these videos every now and then to enhance my skills, I pick up on different things all the time.