Not ridden an FZ600, mine's an FZS1000.
But FFS
Jamie, a high (7k) rpm is not essential when cornering, whether on the 600 or 1000. Unless your really pushing, which is not usual on public roads, even nationals, is it, really? Position, speed and gear, in that order (see Grahamm above) are the important roadcraft bits we should all be considering on approach, wet or dry. Get your route correct for the corner, reduce your speed, either with brakes or deceleration in the gear you're already in, then select the right gear for the circumstances, which is usually lower. In the wet, your not gonna want a lightning snappy reaction from your throttle otherwise if it's too responsive (7k?) you may lose grip as the rear wheel spins. So YOU choose the gear that feels right for the bend (too may variables to be precise here) which will keep the bike under a state of 'constant' acceleration - which means not trying to do your best quarter mile time through the curve, merely keeping the cables tight, keeping the power 'on' until you see the bend opening up allowing you to feel braver and feeding on more throttle. Keeping it 'under power' keeps the back end 'squatting' - a desired condition for grip on the rear wheel innit! We all get it wrong sometimes, me too and peeps say 'Don't use your front brake in a bend', but sometimes you might have to, 'specially if your dabbing the rear and your still not slowing enough, Just don't grab a handful of front all of a sudden or you'll be kissing the tarmac quicker than you can say 'FOC-U' - Smooooth is the key with all your movements and decisions in the wet.
And DRYROB, clutch should be left alone when negotiating the corner, not slipping it, if that's what you mean. Clutch would've been used to select the correct gear on approach, of course. The bike should be just pulling, not coasting with clutch lever 'in' ... keeping the power constant, but not snappy, 'till you can see opportunity to move quicker safely. Suppose there's a degree of clutch slipping when negotiating 90 degree, main road into side street cornering though? Is that what you meant?
There's always good advice here, but if it's a genuine desire to improve your skills, get yourself a copy of the police manual, it's the safest way to ride fast, but not the fastest way, which is better left for the tracks. Get on an advanced course too, but try to make an effort with the book first it'll make more sense, if you're serious, persevere and digest over time.
Best of luck and here's to some sunshine for the rest of what's left of Summer 2012!