I don't really know much about your style of play, but you sound a LOT like me. I didn't know much about string tensions until I did some research very recently.
Either you can have a lot of power, a lot of control, or a comfortable blend. I'd say that if you put a lot of power on your shots, unless you're consistently getting outpowered, that you should focus on control, so that you can hit your favorite power-shots more consistently.
So basically, if you have a lot of power, control can become a big issue...I know it definitely is for me. On my new racquet, I got it strung at 62 pounds, and my game improved from a 4.0 to a 4.5.
Also, going back to the control issue, topspin strings help, too. I use Prince Top spin with Duraflex, I highly recommend that you use those.