w00t! The knuckleball community is growing.
Well one thing is not only should you try to get more velocity but, it's hard to see a ton of movement from the pitcher's perspective. I personally see the movement every now and then but, not a lot.
Everyone throws the knuckleball differently and I will tell you one thing that has worked for me to get velocity is to explode with my hips but to release early so that my fingertips follow to my normal release point.
Btw: Before this last season I was not a pitcher, I was OF/1B and then at our first practice we were fooling around, and I had worked with a knuckleball before but, just throwing around and then my coach saw it and now I'm working hard to be a pitcher, I still primarily use the k-ball because it is how I became a pitcher but, I'm working a fastball and a curve now that I will use next year and hopefully get working with all of them.