Hi Tim and welcome to the YOC, nothing wrong with your bike and fitting a bigger back wheel will not make it into what you want, if your after speed through the corners then the only real way is practice or you can learn the hard way or do an advanced rider course that would have you whipping round the bends in no time flat, not cheap and it means you have to relearn some things your doing now but doable, but the thing is mate that it's a ROAD that has people on it not a race track that you can see how fast you can go on, that way lies a ban or a coffin, you want to race go to a track day, you want to ride and have fun then learn to be the best biker you can be on the bike you have. Just my ten pence worth you understand but treat the road and other road users with respect even if they are a bunch of arseholes.