change spin with backhand

I'm a shakehand forehand player with a very consistent backhand block. I move around pretty quickly, but one trouble I've been having was serves that are very quick to the backhand and underspin. I like to attack fast and off the bounce and usually this messes me up because it would always go to the net when I try to use my backhand because it's hard to change the spin. I heard it's really hard to return those serves unless you push it back. How do you guys deal with it?

Your backhand is quite strong (i remember your vid)
in fact at the time it was your stronger wing.. Considering you have a good technique then all i can say is you need to get your timing right and try to adjust your bat angle when you hit the ball. Start lower and contact the ball in front of your body..
and contacting the ball nearer to the top of the bat usually helps, because that is the part of the bat that travels the fastest.. and don't forget to follow trough the stroke..

hope it helps..