Like you said, more spin and pace generally means get some more racquet head speed. That might solve your problem.
If you need help, maybe trying crossing your poly with your favorite synthetic or multi. That might get you some more power without sacrificing too much spin.
Switching racquets should only be done after you've tried several string options.
HEAD Graphene Radical Pro 365g 9HL
Pro's Pro Pure Aramid 1.10/ Pro's Pro Intense Heat 1.25 @ 36 lbs