How much can you get from changing racquet? I’d consider 2 options where you can get significant improvement:
- your current racquet is too heavy, and you struggle to speed it up enough; lighter racquet would help, if you have basic technic to swing fast
- more forgiving racquet will boost consistency in your deliveries, where off-center hits will not punish you much
For both cases, going for a PD is promising. If you are good and speeding up racquet heads with higher SW - PD tour/Roddick sounds even better. If not, XL frame might be good choice.
Just like with any other on-court action, whatever makes it easier to achieve and repeat goes as top solution