I've never heard of anyone using a larger fuel pump but that doesn't mean it hasn't happened. Are you sure you don't have a bad fuel pump, bad regulator, pinched fuel line, or clogged fuel filter? Are you having problems at any certian RPM range? (i.e. 10k rpm and up)
I haven't worked on bikes much, but i'm an auto mechanic and the same principles apply. All you need to find is higher flow rate injectors. I'd talk to a honda car dealership and see if the parts guy can get you some specs on an injector for like an accord or civic. Don't forget though that if you go that route to get the connectors with them too, then just splice them in. Good luck with install and post some pics when completed I bet it looks sweet.