You must have solid technique and consistency to shoot the scores that you do. You prolly also have good "smash factor". The extra yards you seek will come from increased swing speed or from maximising overall distance from the same swing speed.
I've recently been through this with my wife, who has a low swing speed (prolly much lower than yours). We went through everything and in the final analysis getting a driver that gave a better trajectory and more bounce and roll seemed the best route forwards. So I picked one for her 
And for once something actually worked, she's gained 25 or more yds in the last 3 weeks. In her case it was a change from a Ladies 14* TM driver to a Men's Cobra 10.5* driver. I suspect you already use a Men's driver, but it may be possible to fine-tune to produce a ball-flight which will maximise overall distance.
Otherwise, its a question of increasing swing speed which is not easily achieved, by doing strength building stuff in a gym (yuck!), or working on technique to produce more lag (takes forever to change and not easy to achieve). So I think maxing your potential distance with what you already have is the way to go, and that means getting the best possible driver fit.
