IF you like your current racquets, then increase the weight in a polarized fashion. Add weight to the handle and the head (12:00 noon), which increases swingweight, which increases power.
If you are not happy with your racquet, then use TW's racquet power comparison tool and put your top 3 choices along with your racquet it on there. it will tell you how much more powerful something is. Find a bunch that fit your requirements and then demo them.