Just some experience replacing a steel fork with a carbon one (on our tandem).
It took 1kg off the bike, so that was a huge plus and it really helped make the road buzz less. You may want to look at a different rake fork it you find your bike is a bit hard to steer (ie takes a bit of an effort to turn or the turning circle is large) otherwise try and get exactly the same rake as your current bike.
Can you mount thinner tyres on your current wheels? Going down to a 23 might make a difference too.